单词 | meta- |
释义 | meta-prefix 1. Denoting change, transformation, permutation, or substitution.All examples of this use of the prefix are given as main entries. See, e.g., metachromatism n., metachrosis n., metagraphy n., metaphysis n.1, metonomatosis n. 2. With sense ‘beyond, above, at a higher level’. a. (a) Prefixed to the name of a subject or discipline to denote another which deals with ulterior issues in the same field, or which raises questions about the nature of the original discipline and its methods, procedures, and assumptions.Cf. earlier metamathematical adj., metaphysics n., metapolitical adj., metapolitics n., metatheology n. meta-economics n. Brit. , U.S. , ΚΠ 1916 Amer. Econ. Rev. 6 137 Let there be, in like manner, a ‘meta-economics’ concerned with the economics of the supersensible. 1949 Q. Jrnl. Econ. 63 471 Economic science may push back the borders of ‘meta-economics’ by subjecting assumptions to empirical test. 1986 Jrnl. Econ. Lit. 24 1790/2 We would descend from doing ‘meta-economics’ to economic science. meta-lexicography n. Brit. , U.S. ΚΠ 1983 H. E. Weigand in R. R. K. Hartmann LEXeter '83 Proc. 13 We must bear in mind that writing on lexicography is part of meta-lexicography and that the theory of lexicography is not part of lexicography. 1993 J. Sykes & K. Schofield tr. B. Svensén Pract. Lexicogr. i. 1 Lexicography also includes the development and description of the theories and methods which are to be the basis of this activity. This part of the subject is sometimes called metalexicography. metaphilosophy n. Brit. , U.S. ΘΚΠ the mind > mental capacity > philosophy > [noun] > knowledge, study, or subject > branches or methods practica1393 syncretism1618 eclecticism1798 syncreticism1860 eclectism1867 metaphilosophy1941 1941 Jrnl. Philos. 38 668 The impression that Bacca's whole enterprise smacks of something beyond philosophy, meta-philosophy, a product of a theological voice in the wilderness. 1970 M. Lazerowitz in Metaphilosophy 1 91 Metaphilosophy is the investigation of the nature of philosophy, with the central aim of arriving at a satisfactory explanation of the absence of uncontested philosophical claims and arguments. 1994 Philos. & Phenomenol. Res. 54 453 Such a conceptual idealism aligns itself smoothly with a metaphilosophy of experiential perspectivism. (b) Also applied to related adjectives. meta-economic adj. Brit. , U.S. , ΚΠ 1937 Econ. Jrnl. 47 597 The author distinguishes, within the group of ‘meta-economic’ arguments in foreign trade theory, three types. 1986 Jrnl. Econ. Hist. 46 831 Cliometricians have been reluctant to resort to such seemingly meta-economic arguments. metalexicographical adj. Brit. , U.S. ΚΠ 1983 H. E. Weigand in R. R. K. Hartmann LEXeter '83 Proc. 19 I have used the distancing ‘so-called’ for the following reason, among others: in the meta-lexicographical literature the two terms and their equivalents in other languages are used very differently. 1991 Internat. Jrnl. Lexicogr. 4 ii. 156 Examination of the microstructure of all these dictionary databases shows that the metalexicographical descriptive methods vary greatly. meta-philosophical adj. Brit. , U.S. ΘΚΠ the mind > mental capacity > philosophy > [adjective] > branches synthetical1620 meta-philosophical1942 1942 Mind 51 284 ‘Why are no philosophical disputes ever settled?’ It is with this ‘metaphilosophical’ problem..that Professor Ducasse's book..is concerned. 1979 Yale French Stud. No. 58. 96 Marx and Heidegger try to surpass philosophy... Their thought could be called metaphilosophical. 1992 Nous 26 245 Cohen's metaphilosophical distinctions between categorical and hypothetical, and between deductive and inductive forms of analytic philosophizing. meta-sociologistic adj. Brit. , U.S. , ΘΚΠ society > society and the community > study of society > [adjective] > theories or methods of analysis functional1884 Webbite1890 neo-critical1894 structural-functional1898 Tolstoyan1898 functionalist1907 Webbian1913 Paretian1916 situational1916 Paretan1932 verstehende1933 reflexive1934 same-level1934 sociographic1934 idealistic1937 ideational1937 Parsonian1945 social Darwinist1945 culturalist1948 structural1948 contextualized1951 metasociological1953 structural functionalist1953 meta-sociologistic1964 Lévi-Straussian1967 postcolonial1970 decontextualized1971 cliometric1974 postcolonialist1981 intersectional1989 1964 P. Meadows in I. L. Horowitz New Sociol. 448 Formulations which phrase a meta-sociologistic model, that is, the theme that beyond the teeming and changing varieties of social life..there are social patterns generating and guiding the social work life. b. Chiefly Logic and Linguistics. Prefixed to various terms to denote something of a second-order or more fundamental kind, esp. a construct, method, classification, etc., which is concerned with the underlying principles of a system, or applies to the whole of a system. (a) meta-condition n. Brit. , U.S. ΘΚΠ the mind > language > linguistics > [noun] > specific features of linguistic analysis structuring1890 over-differentiation1921 hypostasis1933 contextualization1934 scatter1934 opposition1936 minimality1953 mapping1955 biuniqueness1959 linearity1959 n-gram1963 meta-condition1972 optionality1972 society > computing and information technology > programming language > [noun] > high-level language > language > features of meta-condition1972 1972 Z. Bar-Lev in Glossa 6 180 A set of ‘semantic metaconditions’ that specify the way in which semantic properties and relations must be represented in semantic structure. 1991 Mind 100 9 The proposal would require that the fused idiom either expressed a different ineffable condition in each sentence in which it occurred or else expressed a single ineffable meta-condition. meta-criterion n. Brit. , U.S. ΚΠ 1953 C. E. Bazell Ling. Form v. 63 Universality of application is only one meta-criterion for the choice of criteria. 1954 C. F. Hockett in Word 10 233 Neither any existing version of IA nor any existing version of IP meets all the metacriteria. 1991 Jrnl. Royal Statist. Soc. B. 53 91 Justification for the prequential principle can be based on the analysis of Dawid.., which argues that it constitutes a vital ‘meta-criterion’ for assessing the adequacy of any proposed theory of empirical probability. meta-criticism n. Brit. , U.S. ΚΠ 1954 P. F. Strawson in Mind 63 416 There is scope for metacriticism, for an examination of the way in which the vast and varied vocabulary we employ in discussing works of art is used. 1966 Philosophy 41 320 The aesthetician..is concerned (among other things) with metacriticism. 1985 Rev. Eng. Stud. May 298 The vogue for metacriticism..so often relegates the literary text to secondary importance. meta-grammar n. Brit. , U.S. ΚΠ 1969 Jrnl. Philos. 66 126 The task of linguistic theory, or metagrammar. 1987 G. C. Horrocks Generative Grammar iii. 174 Such a metagrammar would be a combination of language-specific information and universal principles. meta-system n. Brit. , U.S. ΚΠ 1933 Philos. Rev. 42 185 Systems of the same family have common factors which together constitute a meta-system. 1956 J. H. Woodger tr. A. Tarski Logic, Semantics, Metamath. 116 It is possible to construct a particular science, namely the ‘metasystem’, in which the given system is subjected to investigation. 1989 Profession (Mod. Lang. Assoc. Amer.) 11/1 The obvious examples coming to mind are the changing configurations in the human sciences brought about since the nineteenth-century metasystems of Freud, Marx, and Darwin. meta-theorem n. Brit. , U.S. , ΚΠ 1937 Jrnl. Symbolic Logic 2 147 The definitions D1, D4, and D5 are of course adopted for all formulae ϕ and ψ; D3 for every formula ϕ... Similar generality is intended for the rules and ‘metatheorems’ which will follow. 1971 G. Hunter Metalogic p. xii Complete proofs for metatheorems (theorems about a system) are..more laborious for natural deduction systems than for axiomatic ones. 1995 Jrnl. Symbolic Logic 60 222 The new metatheorem grew..out of an effort to find a new proof of Ash's metatheorem. meta-theory n. Brit. , U.S. , ΚΠ 1929 H. B. Curry in Amer. Jrnl. Math. 51 368 With each theory there is associated a metatheory in which we reason intuitively about the theory. 1956 E. H. Hutten Lang. Mod. Physics iii. 81 When we want to explain how scientific theories are constructed..we must speak about them; and this requires a suitable terminology. This meta-theory, or methodology, is as necessary to science as grammar is to ordinary language. 1989 Behavioral & Brain Sci. 12 770/2 IP is metatheory (a characterization of the goals for a field) rather than a theory per se. (b) metacritical adj. Brit. , U.S. ΚΠ 1949 Philos. Rev. 58 333 Let us limit our attention to those metacritical theories which deny a function in criticism to [general statements or norms]. 1963 Listener 3 Jan. 21/1 They [sc. the techniques of modern criticism] could make exciting sense (if not in strictly critical terms, then in metacritical ones) of works which would have seemed absurd if taken literally. 1995 Jrnl. Hist. Ideas 56 518 A meta-critical approach which tends to investigate the language of art criticism in order to clarify the traditionally vague concepts which surround the perception of art works. meta-theoretic adj. Brit. , U.S. , ΚΠ 1929 H. B. Curry in Amer. Jrnl. Math. 51 368 The aim of mathematical logic is..not to reduce mathematics to a formalism,..but rather to analyze logic with a view to obtaining a greater command over its use... In this paper we shall adopt this metatheoretic point of view. 1965 B. Mates Elem. Logic viii. 128 We are now in a position to..give informal proofs of a number of metatheoretic generalizations about the theorems of logic. 1994 Contemp. Sociol. 23 899 Anyone who reads it [sc. the book] will..be less susceptible to the glib metatheoretic chatter endemic to the field. meta-theoretical adj. Brit. , U.S. , ΚΠ 1938 Philos. Rev. 47 74 The concept of truth can neither be defined nor applied without a somewhat detailed meta-theoretical investigation. 1989 Appl. Linguistics 10 368 In extending linguistic theory to the study of L2 learning, decisions have to be made at what one might term the ontological, metatheoretical, theoretical, and descriptive levels of linguistic inquiry. (c) metacritically adv. Brit. , U.S. ΚΠ 1970 A. Rodway Truths of Fiction i. 9 Concentrate, metacritically, on what the text refers to. 1994 Amer. Lit. 66 p. vi Meta-critically, Professor Renker raises questions about the ways in which scholarly information gets into..the critical debates on a major figure. c. Chiefly Computing. Prefixed to technical terms to denote software, data, etc., which operate at a higher level of abstraction. metacompiler n. Brit. , U.S. a compiler used to compile compilers for (usually syntax-oriented) programming languages.ΚΠ 1967 Computer Group News Jan. 7/1 These special-purpose metacompilers are not much good for anything but compiling. 1985 Personal Computer World Feb. 131/4 Finite state machines, metacompilers,..and hybrid hardware/software systems. 1994 Forth Dimensions 16 ii. 6/1 The method discussed is carried out with no hardware or software except the host computer, the target, the text editor, and the metacompiler. metadata n. Brit. , U.S. , ΚΠ 1968 P. R. Bagley Extension Programming Lang. Concepts (Univ. City Sci. Center Philadelphia) 26 A second data element..represents data ‘about’ the first data element. This second data element we might term a ‘metadata element’. Examples of such metadata elements are: an identifier, a domain ‘prescriptor’ [etc.]. 1977 ACM SIGMOD Rec. Dec. 10/1 A simple inquiry of the data dictionary can show what metadata (that is, data about data and functions) remains to be collected. 1987 Philos. Trans. (Royal Soc.) A. 322 373 The challenge is to accumulate data..from diverse sources, convert it to machine-readable form with a harmonized array of metadata descriptors and present the resulting database(s) to the user. 1998 New Scientist 30 May 35/2 With XML, attaching metadata to a document is easy, at least in theory. metafile n. Brit. , U.S. a device-independent file format that encodes graphical data so as to allow it to be transported to and displayed on different machines or systems; a file created in such a format.ΚΠ 1979 Computer Graphics Q. Aug. iv. 1 A need exists for a standard definition of a device-independent intermediate display file. Such a file (often referred to as a metafile, pseudo display file, or device-independent plot-file) could..be used to transfer ‘pictures’ between two computing sites. 1992 Sun World May 84/2 Screens can be saved in an ASCII metafile format so that finished screens can be run on any major UNIX or VMS workstation. 1993 Macworld Dec. 113/3 When I transferred a Windows Word file with an embedded EPS file, the EPS file was replaced with a PICT preview (a translation of the Windows metafile preview for the embedded EPS file). 3. Chiefly Anatomy and Zoology. Forming terms in which meta- denotes position behind or at the back. Sometimes correlated with pro- prefix2 2a and meso- comb. form. metabranchial adj. Brit. , U.S. , ΚΠ 1877 T. H. Huxley Man. Anat. Invertebrated Animals vi. 343 The branchial region is sub-divided into epibranchial, mesobranchial, and metabranchial. 1935 Amer. Midland Naturalist 16 382 Metabranchial areolations tranversely elongate. 1992 M. Stachowitsch Invertebr. 458/2 Branchial region,..may be subdivided (from anterior to posterior) into epibranchial, mesobranchial, and metabranchial regions/lobes/areas. metaloph n. Brit. , U.S. (in some mammalian orders) the posterior ridge of a molar or premolar tooth; cf. ectoloph n. at ecto- comb. form , lopho- comb. form.ΚΠ 1892 H. F. Osborn in Amer. Naturalist 26 437 Metaloph = Posterior crest [of upper molar]. 1903 Amer. Museum Jrnl. Suppl. Jan. Guide Leaflet No. 9. 20 (caption) Metaloph. Protoloph. Upper molar of modern horse, showing early stages of wear of the tooth. 1974 Ecol. Monogr. 44 49 Stage 1 shows some wear on all teeth, but all cones and ridges remain distinct..; stage 2, the protostyle and entostyle of the second molar become united; stage 3 the protoloph and metaloph of the first molar become united. 1988 Texas Jrnl. Sci. 38 251 In the enamel cap pattern of Dipodomys the protoloph is united with wear to the metaloph by the metacone along the labial margin of the tooth. metapore n. Brit. , U.S. Anatomy rare = foramen of Magendie n. at foramen n.ΚΠ 1889 B. G. Wilder in A. H. Buck Ref. Handbk. Med. Sci. VIII. 121/2 Any communication with the ectal surface is presumably artificial, excepting only the metapore (‘Foramen of Magendie’). 1912 B. G. Wilder in Science 3 May 692/1 The prefix lends itself readily to useful and euphonious compounds [such as] metapore (‘Foramen of Magendie’). 1994 F. P. Bigey in P. J. Hayward et al. Biol. & Palaeobiol. Bryozoans 16 The outline of metapore openings changes from subcircular to suboval. 2010 S. Cavalheiro et al. in C. Mallucci & S. Sgouros Cerebrospinal Fluid Disorders i. 20 Initial observations on human fetal material suggested that the metapore appeared in the fifth month. ΚΠ 1863 J. D. Dana in Amer. Jrnl. Sci. 36 323 The condition may be described as..Metasthenic..if a posterior pair [of locomotive organs] is the more important and the anterior are weak or obsolete. 1863 Amer. Jrnl. Sci. 86 323 Gallinaceous Birds, Ostriches, &c., being poor at flying, or incapable of it, are metasthenic. 1863 Amer. Jrnl. Sci. 86 335 The two highest divisions, Prosthenics and Metasthenics. 4. Chemistry. a. Chiefly in the names of chemical compounds and their related adjectives: denoting relationship to or derivation from the compound to the name of which meta- is attached. Cf. ortho- comb. form 2a, pyro- comb. form 3a. The use of the prefix in chemistry was first introduced by T. Graham in 1833 ( Philos. Trans. Royal Soc. 123 277): see metaphosphate n., metaphosphoric adj. (a) spec. denoting the least hydrated of a series of oxoacids formed from the same anhydride, or an anion or salt of such an oxoacid. metachloral n. Brit. , U.S. ΚΠ 1876 Encycl. Brit. V. 676/2 When kept for some days..chloral undergoes spontaneous change into the polymeride metachloral,..a white porcelaneous body. 1922 J. J. Sudborough Bernthsen's Text-bk. Org. Chem. (new ed.) v. 136 Chloral..easily changes into a solid polymeric modification, meta-chloral, but is regenerated from this upon heating. 2002 R. J. Cremlyn Chlorosulfonic Acid iv. 165 Metachloral and chloral hydrate similarly afforded the octachloroether 86 on treatment with chlorosulfonic acid. metaformaldehyde n. Brit. , U.S. , ΚΠ 1888 Ann. Rep. Board of Regents Smithsonian Inst. (1890) App. 445 in U.S. Congress. Serial Set (50th Congr., 2nd Sess.: House of Representatives Misc. Doc. 142) XIV The oxymethylene, which is with difficulty soluble, is probably metaformaldehyde (CH2O)3. 1897 Amer. Naturalist 31 95 A precipitate of Para- and Metaformaldehyde, insoluble in water at ordinary temperatures, is formed. 1936 I. Heilbron & H. M. Bunbury Dict. Org. Compounds II. 594/2 Metaformaldehyde. 1967 I. L. Finar Org. Chem. (ed. 5) I. viii. 191 When allowed to stand at room temperature, formaldehyde gas slowly polymerises to a white solid, trioxymethylene (metaformaldehyde, trioxan), (CH2O)3. 2006 Nelson's Dir. Investm. Res. 3 242/1 Major chemical products of the Group include synthetic ammonia, urea, ammonium nitrate, pentaerythritol, metaformaldehyde and sodium formate. metagelatin n. Brit. , U.S. , ΚΠ 1858 T. Sutton Dict. Photogr. Metagelatine. 1879 Encycl. Brit. X. 131/2 Gelatin so treated [with hot solutions of oxalic acid] has been called metagelatin. 1906 N.E.D. at Meta- Metagelatin, a form of gelatin that remains fluid, used in photography, made by boiling and cooling a solution of gelatin several times. 2007 K. Shyamsundari & K. Hanumantha Rao Histochem. in Focus vi. 88 If heated too much, gelatin gets transformed into metagelatin which will not harden at room temperature. ΚΠ 1862 H. Watts tr. L. Gmelin Hand-bk. Chem. XV. 206 Metagummate of lime. Brit. , U.S. ObsoleteΚΠ 1860 Pharmaceut. Jrnl. & Trans. Apr. 519 When metagummic acid is boiled with lime, a soluble substance is obtained identical with gum arabic. 1890 J. S. Billings National Med. Dict. I. 251/1 Cerasin, the insoluble constituent of cherry gum; chemically, a calcium salt of meta-gummic acid. 1906 N.E.D. at Meta- Metagummic = Metarabic. ΚΠ 1890 New Sydenham Soc. Lexicon Metamorphia, one of the alkaloids separated from laudanum. metamorphine n. ΚΠ 1864 H. Watts tr. L. Gmelin Hand-bk. Chem. XVI. 441 The washed mixture of carbonate of baryta and metamorphine was treated with alcohol to extract the latter. 1865 H. Watts Dict. Chem. III. 976 Metamorphine, an opium-base, the hydrochlorate of which is obtained, as a residue, in the preparation of opium-tincture by means of lime and sal-ammoniac. 1974 S. Lem Futurolog. Congr. 130 With metamorphine, for example, you can have an affair with a goat, thinking it's Venus de Milo herself. 2010 J. A. A. Jones Water Sustainability v. 58/1 Zuccato and Castilioni report substantial amounts of morphine, metamorphine and ecstasy entering sewage plants. ΚΠ 1838 T. Thomson Chem. Org. Bodies 124 M. Fremy was unable to obtain any of the meta-oleates in a crystallized state. metaoleic adj. Brit. , U.S. , ΚΠ 1838 T. Thomson Chem. Org. Bodies 123 Meta-oleic acid differs from it [sc. oleic acid] by containing two additional atoms of water. 1855 W. Odling tr. A. Laurent Chem. Method 54 (note) The hydroleic, metoleic, and metamargaric [acids] might be adduced as contrary to this conclusion. 1906 N.E.D. at Meta- Metaoleic (also Metoleic) acid, an acid resulting from the action of sulphuric acid on oleic acid. 1992 M. Novitski Auguste Laurent (Notes) 26 He [sc. Frémy] spoke of an atom of metaoleic acid. ΚΠ 1873 C. H. Ralfe Outl. Physiol. Chem. 132 The parapeptone being removed by filtration, the neutralized filtrate is again acidified when another precipitate, metapeptone, is thrown down. metasalt n. Brit. , U.S. , ΚΠ 1859 W. Odling in London, Edinb., & Dublin Philos. Mag. 4th Ser. 18 374 The following Table illustrates the relations of the meta- and ortho-salts. 1870 Nature 15 Sept. 470/2 Meta-salts are most stable. 1892 M. M. P. Muir & H. F. Morley Watts' Dict. Chem. Meta-acids and meta-salts. 1950 N. V. Sidgwick Chem. Elements I. 788 The ordinary salts are of the type of MSboO3, x H2O, and are usually regarded as metasalts. 2002 Russ. Jrnl. Inorg. Chem. 47 937/1 The addition reaction of an alkali metal hydroxide or oxide to a salt of the same metal can yield..an orthosalt from a metasalt, for example..Na2O + NaNO3 → Na3NO4. metatartaric adj. Brit. , U.S. ΚΠ 1848 W. T. Brande Man. Chem. (ed. 6) vii. 1315 Saccharic Acid... Erdmann, who repeated Guérin Varry's experiments in 1837, regarded this acid as isomeric with tartaric acid, and called it metatartaric acid. 1970 M. A. Amerine & M. A. Joslyn Table Wines (ed. 2) xi. 522 Metatartaric acid, a polylactide of tartaric acid, is produced by heating the latter at 170°C (338°F) for 120 or more hours. 2006 P. Ribéreau-Gayon et al. Handbk. Enology II. i. 42/1 There are many laboratory tests for assessing the effectiveness of a metatartaric acid preparation. ΚΠ 1856 H. Watts tr. L. Gmelin Hand-bk. Chem. X. 328 Metatartrate. metatitanic adj. Brit. , U.S. , ΚΠ 1854 R. D. Thomson Cycl. Chem. 363/2 Metatitanic Acid, Ti3O6. Small shining plates, separating when anhydrous bichloride of titanium is saturated with carbonate of barytes, adding water and boiling rapidly. 1906 H. J. H. Fenton Notes Qualitative Anal. (new ed.) 169 Metatitanic acid TiO(OH)2 is obtained when a solution of Ti(OH)4 in HCl is boiled. 2003 J. Winkler Titanium Dioxide vii. 102 Freshly precipitated titanium oxy-hydrate (‘metatitanic acid’) from the hydrolysis is washed, reacted with sodium hydroxide to sodium titanate (Na,TiO,). and then ‘peptized’ with hydrochloric acid. metatungstic adj. Brit. , U.S. ΚΠ 1854 R. D. Thomson Cycl. Chem. 363 Metatungstic Acid, HO, W3O9. The ammoniacal salt of this acid is obtained by boiling for some hours bitungstate (paratungstate) of ammonia. 1888 Philos. Trans. 1887 (Royal Soc.) B. 178 54 Another test for peptone..consists in..adding to it acetic acid and a drop of metatungstic acid. 1935 Proc. Royal Soc. A. 150 309 For the boro- and metatungstic acids, the pure 3-cæsium salts are obtained if there is any excess of acid. (b) Denoting a polymer of the named compound. Brit. , U.S. ObsoleteΚΠ 1861 T. Graham in Philos. Trans. (Royal Soc.) 151 207 Two soluble modifications of alumina appear to exist, alumina and metalumina. 1919 Rep. Brit. Assoc. Advancem. Sci. 1918 b5 People have generally been satisfied with distinguishing only two sets of colloidal solutions, which they have called solutions of alumina and metalumina, stannic and metastannic acids, &c. ΚΠ 1890 New Sydenham Soc. Lexicon Metarabic acid, a substance, also called Cerasin, obtained by heating gum arabic to 100°C...It occurs in combination with lime in the insoluble part of cherry-tree gum and in fleshy roots, as beet. meta-arsenate n. Brit. , U.S. , ΚΠ 1861 W. Odling Man. Chem. 338 Metarsenates and pararsenates are converted respectively into monometallic and dimetallic common arsenates by the action of water. 1911 Science 9 June 900/2 At least three forms of arsenate of lead may result, namely, ortho-arsenate of lead (Pb3(AsO4)2, pyro-arsenate of lead (Pb2As2O7) and meta-arsenate of lead ((PbHAsO4)2). 1940 G. H. J. Adlam & L. S. Price Higher School Certificate Inorg. Chem. (ed. 2) xlii. 416 Pyro- and meta-arsenates change immediately to ortho- when dissolved in water. 2008 A. J. Carpousis et al. in L. E. Maquat & C. Arraiano RNA Turnover in Bacteria, Archaea & Organelles x. 194 Sodium meta-arsenate should be handled with care, because it is both toxic and carcinogenic. ΚΠ 1861 W. Odling Man. Chem. 338 Metarsenic acid HAsO3, is formed by gradually heating common arsenic acid to a temperature of 200°–205°. metarsenious adj. Brit. , U.S. rareΚΠ 1907 G. S. Newth Text-bk. Inorg. Chem. (ed. 12) iii. iii. 487 Three classes of arsenites are known, which may be regarded as being derived from the three hypothetical acids—ortho-arsenious acid, H3AsO3, or As(HO)3... Pyro-arsenious acid, H4As2O5, or As2O(HO)4..Metarsenious acid, HAsO2, or AsO(HO). 1937 C. G. Lyons Theoret. Pharmaceut. Chem. xii. 189 The arsenites which are formed are salts either of arsenious acid (H3AsO3), or of metarsenious acid (HAsO2). metarsenite n. Brit. , U.S. (also meta-arsenite) ΚΠ 1906 Science 17 Aug. 198/2 Many years ago Ehrmann found that..Paris green..consisted of three molecules of copper meta-arsenite in chemical combination with one molecule of copper acetate. 1907 G. S. Newth Text-bk. Inorg. Chem. (ed. 12) iii. iii. 487 The pigment known as Schweinfurt green is a double metarsenite and acetate of copper. 1922 T. M. Lowry Inorg. Chem. xxxvi. 705 It also dissolves in alkalies, giving a mixture of a metarsenite and thiometarsenite. 1944 Science 1 Dec. 502/2 Let it be assumed that the sodium metarsenite dissociates with the formation of an arsenical ion. 1996 Proc. National Acad. Sci. U.S.A. 93 8847 (caption) PEG buffer with 50 mM Na2S, 50 mM Na meta arsenite. (c) metabisulphite n. Brit. , U.S. the anion S2O52−; a salt containing this, frequently used as a sterilizing agent or preservative.ΚΠ 1907 Proc. Royal Soc. A. 79 172 The precipitates..were..acidified with sulphuric acid, boiled with potassium meta-bisulphite, and used in the electrolytic arsenic apparatus of Dr. Thorpe. 1962 P. J. Durrant & B. Durrant Introd. Adv. Inorg. Chem. xxi. 839 X-ray analysis has shown that in the metabisulphite ion two oxygen atoms are linked to one sulphur atom, and three oxygen atoms to the other. 1988 New Scientist 19 May 31/3 Sulphites, especially the salt, metabisulphite, are commonly used as food preservatives. They prevent the browning or discolouring of fruit. 1995 Mother Earth News Dec. 70/2 A great way to sterilize is with a solution of metabisulfites, which you can obtain in the form of Campden tablets. meta-cellulose n. Brit. , U.S. , ΚΠ 1877 Chem. News 12 Jan. 21/1 Cellulosic substances (cellulose, meta-cellulose, para-cellulose). 1883 G. L. Goodale in Science 23 Feb. 80/1 Cellulose dissolves at once in cuprammonia; paracellulose, only after the action of acids; metacellulose, not even then. 1928 Amer. Jrnl. Bot. 15 539 He [sc. L. Mangin] also maintained that the presence of nitrogenous matter or of pectic compounds frequently prevented the penetration of reagents and accounted for the failure to secure tests for substances actually present... With this conviction in mind he was the first to propose that such terms as meta-cellulose or fungus cellulose be discarded. 2003 M. Geiker in O. Wallevik & I. Nielsson Self-compacting Concrete 37 Materials used include limestone containing Portland cement.., meta-cellulose viscosity agent.., and melamine-based superplasticizer. meta-element n. Brit. , U.S. Chemistry rare (now historical) (W. Crookes' name for) a chemical entity exhibiting slight variability in atomic weight and other properties, regarded as neither an ordinary element nor a compound (later recognized to be a mixture of elements).ΚΠ 1886 W. Crookes in Chem. News 54 117 ‘Meta-element’ does not appear here (meso-element does). 1888 W. Crookes in Jrnl. Chem. Soc. 53 487 The possible existence of bodies which, though neither compounds nor mixtures, are not elements in the strictest sense of the word;—bodies which I venture to call ‘meta-elements’. 1935 Science 13 Sept. 236/1 He [sc. Crookes] called the components ‘meta-elements’, but unfortunately for his reputation as a prophet the experimental results on which his idea was founded were later proved to be fallacious. b. [After use in German by C. Graebe in Ann. der Chem. u. Pharm. (1869) 149 27.] Forming terms and names of compounds in which meta- denotes substitution in a benzene ring at two carbon atoms separated by one other (e.g. at carbon atoms 1 and 3), or location at the second carbon atom from a given substituent. Frequently italicized. Cf. meta adj.; ortho- comb. form 2b; para- prefix1 3b.Also symbolized in the names of compounds by ‘m-’, e.g. m-xylene, and by ‘1,3-’, e.g. 1,3-xylene. ΚΠ 1871 Jrnl. Chem. Soc. 24 680 The nitro-groups in dinitrotoluene occupy, respectively, the para- and meta-positions. 1871 Jrnl. Chem. Soc. 24 682 Metatoluidine. 1875 Jrnl. Chem. Soc. 13 156 Metanitrometachlorophenol appears to be converted into metanitrodichlorophenol by the action of chlorine. 1876 Jrnl. Chem. Soc. 1 212 The three Isomeric Dibromobenzenes... Paranitrobromobenzene,..Metanitrobromobenzene,..Orthonitrobromobenzene. 1885 I. Remsen Org. Chem. (1888) 241 Coal-tar xylene consists of three isomeric hydrocarbons..known as ortho-xylene, meta-xylene, and para-xylene. 1905 Brit. Med. Jrnl. 27 May 1144 Sodium meta-coumarate... The meta-coumaric acid required for this preparation was produced synthetically from meta-nitrobenzaldehyde. 1946 Nature 28 Dec. 930/1 The problem of effecting ring closure through the meta- and para-positions of the benzene nucleus. 1991 Jrnl. Org. Chem. 57 349/1 These changes in the emission spectra of the meta-bridged terphenyls indicate a photochemical reaction that is undetected in the unbridged analogues. 5. Chiefly Science. With sense ‘that exists or is situated between two distinct sections or segments of a body, etc.’. ΚΠ 1859 T. H. Huxley in Proc. Royal Soc. 9 426 Professor Goodsir's terms of Somatomes for the segments and Metasomatomes for their interspaces. 1859 T. H. Huxley in Proc. Royal Soc. 9 427 The intervals between every pair of metasomatomes. 1880 Philos. Trans. 1879 (Royal Soc.) 170 620 The embryo has now well nigh completed the number of its somatomes; there are a few more than in the last stage. The ‘metasomatomes’ have now the work of developing the vertebræ. ΚΠ 1857 H. D. S. Goodsir in Edinb. New Philos. Jrnl. 5 122 As the mouth is only one of a number of openings situated between somatomes, I find such openings conveniently distinguished as metasomatomic. 1862 Philos. Trans. (Royal Soc.) 152 312 The nostril is a passage lying between the segments to which these bones belong,—what has been named by Professor Goodsir a ‘metasomatomic’ opening. ΚΠ 1842 J. Gwilt Encycl. Archit. Gloss. 1004 Metatome, the space or interval between two dentels. 6. Mineralogy. In the names of minerals: denoting close relationship to or association with the mineral to the name of which meta- is attached; (now usually) spec. denoting (partial) dehydration. ΚΠ 1854 J. D. Dana Syst. Mineral. (ed. 4) II. 297 Metachlorite, foliated columnar, like chlorite. 1865 Amer. Jrnl. Sci. 90 371 Metabrushite. This new mineral has been observed to occur only with the guano as a matrix. 1938 Amer. Mineralogist 23 745 On dehydration..hohmannite apparently loses the four loosely held molecules of water and forms what is here called metahohmannite. 1960 F. H. Pough Field Guide Rocks & Minerals (ed. 3) 221 Torbernite... Metatorbernite is a slightly dehydrated variety, forming by loss of water or directly at slightly raised temperatures. 1990 C. Pellant Rocks, Minerals & Fossils 95 Autunite... Loses some water to become meta-autunite. 1992 W. A. Deer et al. Introd. Rock-forming Minerals (ed. 2) 360 For kaolinite, little or no surface adsorbed water is present and most of the dehydration..takes place between 400 and 525 °C... The dehydroxylated product is sometimes referred to as metakaolin. 7. Botany and Zoology. Forming terms in which meta- denotes occurrence or development at a later time or stage, esp. in ontogeny or phylogeny; sometimes denoting the latest of three stages, correlated with proto- comb. form and meso- comb. form. metatracheal adj. Brit. , U.S. [after German metatracheal (1908 in the source translated in quot. 1908); compare paratracheal adj.] Botany now rare designating parenchyma in wood that is arranged independently of the vessels in tangential bands (now usually called apotracheal); cf. paratracheal adj.ΘΚΠ the world > plants > part of plant > cell or aggregate tissue > [adjective] > of types of tissue parenchymatous1720 cinenchymatous1835 bothrenchymatous1839 uniporous1840 pleurenchymatous1842 prosenchymatous1842 discigerous1844 collenchymatous1884 metatracheal1908 paratracheal1908 1908 L. A. Boodle & F. E. Fritsch tr. H. Solereder Syst. Anat. Dicotyledons II. Concl. Rem. §45. 1143 The wood parenchyma generally forms tangential bands (known as the ‘metatracheal’ parenchyma in contrast to the ‘paratracheal’ parenchyma, aggregated round about the vessels). 1917 Jrnl. Forestry 15 179 The parenchyma is strikingly metatracheal in its distribution. 1950 C. R. Metcalfe & L. Chalk Anat. Dicotyledons I. Introd. p. xxiv Bailey suggests that the word ‘metatracheal’ should be dropped, owing to the different senses in which it has been used, in favour of ‘banded’. 1970 K. Wilson & D. J. B. White Jane's Struct. Wood (ed. 2) vi. 116 Apotracheal parenchyma may occur as..tangentially arranged sheets of cells..or in more extensive tangential bands... The two latter types are sometimes referred to as metatracheal parenchyma but this term is better avoided. 1982 Bot. Gaz. 143 397/1 Axial parenchyma..occasionally occurring in indistinct uniseriate metatracheal bands. 8. Geology. a. Prefixed to the names of rocks and classes of rock (and to adjectives derived from these) to denote that they have undergone metamorphism, as metadiorite, meta-dolerite, meta-granite, meta-sediment, meta-syenite; metaigneous, meta-sedimentary adjs.; metavolcanic n. and adj. ΚΠ 1876 J. D. Dana in Amer. Jrnl. Sci. 111 121 The rocks are..Metamorphic doleryte, metamorphic diabase, and metamorphic melaphyre... To distinguish these metamorphic rocks from the igneous of the same composition, they are named, on my suggestion, metadoleryte, metadiabase, and metamelaphyre. The examples are part of a long series of rock species which have representatives both among igneous (or intrusive) and metamorphic rocks. Other kinds are dioryte and metadioryte, syenyte and metasyenyte, felsyte and metafelsyte, etc. 1920 A. Holmes Nomencl. Petrol. 154 Meta-, a prefix used before the names of igneous rocks to signify that the mineral and chemical composition of the latter have been modified by alteration. 1942 M. P. Billings Struct. Geol. xii. 215 Metasediments, metavolcanics, and meta-igneous rocks are metamorphic rocks derived, respectively, from sedimentary, volcanic, and igneous rocks. 1959 Bull. Geol. Soc. Amer. 70 1699 Nearly all outcrops of the metadiorite are deeply weathered. 1960 Ecol. Monogr. 30 281/1 Sighting across the valley one may observe remnants of the surface in the lower, metavolcanic mountains. 1969 Geochem. Internat. 6 Suppl. 408 The correlations of U and Th with composition for the metagranites show that these two radioelements behave independently. 1973 Nature 21 Sept. 120/1 The metasediments occur in a (refolded) syncline among granitic gneisses. 1988 Nature 22 Dec. 736/1 Only the reservoir represented by the meta-igneous xenoliths is a viable candidate. 1993 Jrnl. Petrol. 34 462 These bodies intrude a variety of metasedimentary and metavolcanic rocks in several fault-bounded, northeast-trending terranes. 1994 Biogeochemistry 26 85 Several natural bedrock surfaces (metagranites) covered with moss or lichen were leached with HCl solutions. b. Forming terms in which meta- denotes a metamorphic process. ΚΠ 1886 J. D. Dana in Amer. Jrnl. Sci. 132 70 A term expressing the chemical nature of the change is desirable, and such a descriptive term is metachemic. 1886 J. D. Dana in Amer. Jrnl. Sci. 132 71 In the derivation of a hornblendic rock from a sedimentary rock, the metamorphism would ordinarily be metachemic; but if from an augitic rock, paramorphic in part if not wholly. 1893 A. Geikie Text-bk. Geol. (ed. 3) iv. viii. 596 Metasomatosis, metasomatic..and metachemic [have been] applied to chemical metamorphism or alteration of constitution or substance. metatropy n. Brit. , U.S. now historical metamorphism that includes physical change without chemical change.ΚΠ 1889 A. Irving Metamorphism of Rock 5 Metatropy, or changes in the physical characters of rock-masses. 1904 C. R. Van Hise Treat. Metamorphism (U.S. Geol. Surv.) 39 It is clear that a classification of metamorphism into paramorphism, metatrophy, and metataxis, restricting these terms to atomic, molecular, and mechanical changes, respectively, is wholly impracticable.] 1983 S. I. Tomkeieff et al. Dict. Petrol. 359/1 Metatropy, changes in the physical characters of rock masses, while there is no essential chemical change either in the rock mass or in its constituents. 9. Medicine. Forming adjectives (now rare) in which meta- has the meaning ‘following or resulting from’. ΚΠ 1898 T. C. Allbutt et al. Syst. Med. V. 862 The meta-arthritic endocarditis. ΚΠ 1898 T. C. Allbutt et al. Syst. Med. V. 164 Metapneumonic pleurisy. metasplenomegalic adj. Brit. , U.S. , ΚΠ 1901 Amer. Jrnl. Med. Sci. 121 392 He would call these cases metasplenomegalic hypertrophic biliary cirrhosis. 1930 A. Piney & S. Wyard Clin. Atlas Blood Dis. 92 In rare cases splenomegaly may be obvious before any evidence of hepatic disease—metasplenomegalic type. This entry has been updated (OED Third Edition, December 2001; most recently modified version published online June 2022). < |
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