hydro-comb. form

1822 T. Webster Imison's Elem. Sci. & Art (new ed.) II. 21 To distinguish the acids formed by hydrogen, from those formed by oxygen, the former are designated by the word hydro, as the hydro~chloric acid.

1853 W. Gregory Inorg. Chem. (ed. 3) 4 If composed of oxygen united to a metalloid, such as carbon, or a metal..the acid is simply named from the metalloid or metal, as carbonic acid, chromic acid. But if the acid contains hydrogen united to a metalloid, the word ‘hydro’ is prefixed; as hydro-chloric acid (hydrogen and chlorine), hydro-sulphuric acid (hydrogen and sulphur), &c.

1721 N. Bailey Universal Etymol. Eng. Dict. Hydrocriticks [1706 Phillips (ed. Kersey), Hydrocritica], critical Judgment of Distempers taken from Sweating.

1886 New Sydenham Soc. Lexicon Hydroaeric sound, the percussion note produced over a cavity containing both water and air. Also, the sounds heard on auscultating a similar cavity.

1887 A. M. Brown Treat. Animal Alkaloids i. v. 46 The hydro-alcoholic solution of the alkaloid was injected hypodermically into a dog of medium size.

1951 A. Grollman Pharmacol. & Therapeutics 757 Color may also be imparted by the addition of..Hydrastis Tincture (N.F.) which..is soluble in alcohol and hydro-alcoholic preparations giving a yellow color.

1969 Biochimica et Biophysica Acta 194 265 (heading) Optical rotatory dispersion of polyglutamic and polyuridylic acids at low temperatures in fluid hydro-alcoholic solvents.

1858 Amer. Jrnl. Sc. 2nd Ser. 25 408 Hydroapatite is a hydrous apatite.

1900 E. F. Smith tr. V. von Richter Org. Chem. (ed. 3) II. 290 Hexahydrobenzene is the parent hydrocarbon of the hydroaromatic substances.

1940 Industr. & Engin. Chem. Apr. 528/2 The cyclization of paraffins to hydroaromatics is preceded by dehydrogenation.

1951 I. L. Finar Org. Chem. xix. 390 Many benzene derivatives may be reduced to the corresponding cyclohexane compounds, and because of this, cyclohexane and its derivatives are known as the hydroaromatic compounds. The cyclic terpenes are hydroaromatic compounds.

1933 Geogr. Jrnl. 81 533 It [sc. the Arctic Institute of the U.S.S.R.]..carries on geological, geomorphological, hydrological and hydrobiological investigations.

1932 Ecology 13 110 The fresh water hydrobiologists, especially the limnologists, have developed a third type of nomenclature based more upon the habitat than on the biotic communities.

1938 Times 19 Feb. 13/2 With Papanin..on Franz Josef Land..were P. P. Shirshoff, a hydrologist and hydrobiologist, E. K. Federoff, [etc.].

1964 Oceanogr. & Marine Biol. 2 379 The three large brackish water lagoons on the continental coast of the Baltic..have long attracted the interest of hydrobiologists.

1972 Nature 28 July 194/1 It is hoped that the committee will be able to produce a register of hydrobiologists working in Britain.

1928 K. E. Carpenter Life Inland Waters p. viii The life of the ocean [has]..engrossed the energies even of followers of the new tradition in Hydrobiology.

1941 J. G. Needham in Symposium Hydrobiol. 3 Hydrobiology is an offshoot from the old maternal rootstock of natural history.

1965 Math. in Biol. & Med. (Med. Res. Council) 309 His [sc. Antonio Moroni's] main interests are human population genetics and hydrobiology.

1881 H. C. Lewis in Proc. Acad. Nat. Sci. Philadelphia 1880 319 Such mica exfoliates slightly when heated, is uniaxial, fusible with difficulty, and might be called Hydrobiotite for convenience.

1892 E. S. Dana J. D. Dana's Syst. Mineral. (ed. 6) 632 Hydrobiotite H. C. Lewis. A hydrated biotite. The name has been similarly but more definitely used by Schrauf.

1934 J. W. Gruner in Amer. Mineralogist 19 558 Specimens 9 and 10 belong to a species for which the name hydrobiotite is proposed. This name was used long ago by Schrauf and others to designate biotite-like material high in water.

1934 J. W. Gruner in Amer. Mineralogist 19 575 X-ray diagrams are necessary to distinguish vermiculite from hydrobiotite.

1962 W. A. Deer et al. Rock-forming Minerals III. 251 Mixed layer clays with vermiculite as a constituent are not uncommon, the most well known being ‘hydrobiotite’, a random mixture of vermiculite and biotite.

1835 C. U. Shepard Treat. Mineral. II. 326 Hydroboracite.

1868 J. D. Dana Syst. Mineral. (ed. 5) 595 Hydroboracite..resembles fibrous and foliated gypsum.

1934 C. E. Tilley in Mineral. Mag. 23 607 In allusion to its composition as an hydrated calcium aluminate (4CaO.Al₂O₃.12H₂O) the name hydrocalumite is proposed.

1968 I. Kostov Mineral. 215 Apart from hydrocalumite, which is rather soft.., the other minerals are hard.

1753 Chambers's Cycl. Suppl. Hydrocardia, a term invented by Hildanus to express a serous, sanious, or purulent tumour of the pericardium.

1900 B. D. Jackson Gloss. Bot. Terms Hydrocarpic.

1960 McGraw-Hill Encycl. Sci. & Technol. IX. 267/1 Such a laboratory is located near the winches used for running out and retrieving a long string of water-sample bottles (hydrocasts).

1968 D. F. Martin Marine Chem. I. i. 8 The vessel must be stationary for the time needed to complete the hydrocast.

1971 Nature 7 May 37/1 In 1966, one hydrocast in this narrow and steep-sided deep revealed a temperature of 29·07°C and a salinity of 74·2‰. Attempts to place a hydrocast in the Chain deep on this cruise failed because of high winds and consequent ship drift.

1902 Encycl. Brit. XXVI. 742/1 Fermentation is certainly at bottom a process of hydrocatalysis.

1902 Encycl. Brit. XXXV. Index Hydrocatalytic action.

1869 H. A. Nicholson Man. Zool. 77 The cœnosarc generally consists of a main stem—or ‘hydro-caulus’—with many branches.

1888 G. Rolleston & W. H. Jackson Forms Animal Life (ed. 2) 246 The hydranth resembles Hydra in all essentials... Like that organism it consists of a hydrocephalis (= oral and stomachal regions) and a peduncle or hydrocope which is very short.

1883 J. W. Mollett Illustr. Dict. Art & Archæol. 174/1 Hydro-ceramic (vessels), Gr., vessels made of a porous clay, in which liquids were put for the purpose of cooling them; they were a kind of alcarazas.

1940 Chambers's Techn. Dict. 428/2 Hydroceramic, porous unglazed pottery, used for filters and for cooling vessels.

1905 F. E. Clements Res. Methods Ecol. iv. 216 Hydrochores..comprise all plants distributed exclusively by water, whether the latter acts as ocean currents, tides, streams, or surface run-off.

1969 L. van der Pijl Princ. Dispersal Higher Plants v. 61 Many hydrochores bend their fruit stalks down..whereas in Nuphar (not purely hydrochorous) the seeds mature above water.

1940 Chambers's Techn. Dict. 428/2 Hydrochoric, dispersed by water.

1905 F. E. Clements Res. Methods Ecol. iv. 218 Most hydrophytes are hydrochorous.

1969 L. van der Pijl Princ. Dispersal Higher Plants v. 61 It is difficult to describe concisely the structural modifications of hydrochory.

1965 D. Bradley Hydrocyclone i. 1 ‘Hydraulic cyclone’ has been abbreviated to ‘hydrocyclone’ and even ‘hydroclone’.

1967 R. L. Whistler & E. F. Paschall Starch II. i. 46 The starch stream..must be further purified by passing..through hydroclones to reduce the protein content.

1888 Philos. Trans. 1887 (Royal Soc.) B. 178 266 After separating from the hydrocele the anterior body-cavity grows towards the ectoderm on the right side.

1900 E. R. Lankester Treat. Zool. III. viii. 23 Whatever may be the homologies of the hydrocoel, there is..no nephridial or other excretory system in Echinoderma.

1962 D. Nichols Echinoderms x. 121 This [sac] is called the left axohydrocoel, the anterior part being the axocoel..and the posterior the hydrocoel.

1873 H. Watts Fownes's Man. Elem. Chem. (ed. 11) 824 Hydrocoumaric acid..exists in the yellow melilot.

1893 Westm. Gaz. 5 Apr. 4/3 The ‘hydro-cycle’—hitherto regarded as more or less a mechanical monstrosity—has at length proved its speed and capabilities... The ‘hydro~cyclists’ finished in good condition.

1898 River & Coast 9 July 13/1 One of the most interesting items was the Hydrocycle versus Skiff Race.

1952 Chem. Abstr. 46 1668 Data are presented on hydrocyclones used as thickeners in starch processing, as classifiers for highly viscous and non-Newtonian liquids and as washers in ore prepn.

1962 Engineering 3 Aug. 146/1 The cone-shaped nozzle at the bottom of the hydrocyclones used by the National Coal Board..(for the separation and thickening of coal and shale fines from water).

1869 H. A. Nicholson Man. Zool. 82 There occur also in the Physophoridæ certain peculiar bodies, termed hydrocysts or ‘feelers’.

1888 G. Rolleston & W. H. Jackson Forms Animal Life (ed. 2) 770 Hydrocysts or feelers..are polypites in which the distal or oral extremity is imperforate and usually armed with cnidoblasts.

1850 J. D. Dana Syst. Mineral. (ed. 3) 213 Hydrodolomite..has the composition of the magnesia alba of the shops.

1962 New Scientist 4 Oct. 31/3 They are using a specially-designed ‘hydrodrill’ to inject relatively small amounts of water into the soil, placing it directly in the plant's root zone.

1962 New Scientist 4 Oct. 31/3 The vine cuttings are simply dropped into holes which have been hydrodrilled.

1858 T. H. Huxley Oceanic Hydrozoa 39 The lateral walls of the hydrœcial canal of the distal nectocalyx.

1861 J. R. Greene Man. Animal Kingdom II. 99 Praya, Hippopodius, and Vogtia have ‘incomplete’ hydrœcia.

1869 H. A. Nicholson Man. Zool. 80 This chamber, which is present..in all the genera, is termed the ‘hydrœcium’.

1882 Spons' Encycl. Industr. Arts V. 1839 Centrifugal hydro-extracting machines..have been tried for separating beet-juice from the pulp.

1928 C. E. Mullin Acetate Silk xxxviii. 437 Yarns or loosely knit fabrics which are not liable to crease may be hydroextracted in the ordinary rotating cage or drum machine.

1952 E. Kornreich Introd. Fibres & Fabrics viii. 143 Fabrics can also be hydroextracted by winding them on a perforated beam which is then inserted in a suitable whizzer.

1895 Trans. Soc. Engin. 1894 227 (heading) The principles and practice of hydro-extraction.

1912 H. H. Hodgson tr. Masselon Celluloid v. 71 100 kilogrammes of bleached pulp after hydro-extraction should weigh 60 kilogrammes.

1963 A. J. Hall Student's Handbk. Textile Sci. ii. 53 The water in wet viscose rayon materials is best removed by hydro~extraction.

1851 Official Descriptive & Illustr. Catal. Great Exhib. IV. 1199 Hydro-extractor..capable of revolving 2,000 times a minute... It will dress..all kinds of materials, cloths, felts [etc.].

1890 W. J. Gordon Foundry 165 The hydro~extractor, in which the yarn is dried like clothes in a laundry, being thrown into a horizontal drum and spun round at lightning speed.

1863 H. Watts Dict. Chem. I. 1066 The hydroferricyanate produced by adding aqueous ferricyanide of potassium to hydrochlorate of codeine, is a very unstable crystalline compound.

1849 D. Campbell Pract. Text-bk. Inorg. Chem. Index 376 Hydroferridcyanic acid, or ferridcyanide of hydrogen. Hydroferrocyanic acid, or ferrocyanide of hydrogen.

1868–72 H. Watts Dict. Chem. V. 20 The hydroferrocyanate [of quinine], C₂₀H₂₄N₂O₂.H₄FeCy₆.2H₂O, is an orange-yellow crystalline precipitate, obtained on mixing the alcoholic solutions of quinine and hydroferrocyanic acid.

1949 Jrnl. Amer. Chem. Soc. 71 3051 (heading) Hydroformylation of unsaturated compounds with a cobalt carbonyl catalyst.

1969 S. A. Miller Ethylene xiv. 1169 The OXO reaction or ‘hydroformylation’ is now an important industrial process.

1886 Hamerton in Longman's Mag. VII. 375 The efficacy of resinous solutions, as hydrofuges.

1941 E. P. Flint et al. in Jrnl. Res. Nat. Bureau of Standards (U.S.) XXVI. 14 An extension of the study revealed that silica could replace water in both 3CaO.Al₂O₃.6H₂O and 3CaO.Fe₂O₃.6H₂O, and that the end products of these substitutions are grossularite garnet, 3CaO.Al₂O₃.3SiO₂, and andradite garnet, 3CaO.Fe₂O₃.3SiO₂, respectively... The hydrous members of the series may be termed ‘hydrogarnets’ to indicate their relationship to the naturally occurring garnets.

1966 W. A. Deer et al. Introd. Rock-forming Minerals 23 In the hydrogarnets there is replacement of SiO₂ by 2H₂O, with vacant Si spaces in the structure.

1921 Glasgow Herald 23 July 7/2 The idea of using hydrogliders for passengers and for mail purposes on the lochs in the outlying districts of Scotland.

1927 Glasgow Herald 26 July 9 The hydroglider which has been constructed..to accomplish the crossing of the Atlantic from Cherbourg to New York.

1961 F. H. Burgess Dict. Sailing 119 Hydroglider, a type of boat that is designed with air-screws as its main means of propulsion.

1943 C. O. Hutton in Trans. & Proc. Royal Soc. N.Z. 73 174 (heading) Hydrogrossular, a new mineral of the garnet-hydrogarnet series.

1943 C. O. Hutton in Trans. & Proc. Royal Soc. N.Z. 73 174 All of the isomorphous mixtures between plazolite and grossularite are termed by the writer, hydrogrossular.

1966 W. A. Deer et al. Introd. Rock-forming Minerals 26 Hydrogrossular has been taken as the name for members of the series 3CaO.Al₂O₃.3SiO₂—3CaO.Al₂O₃.6H₂O with a composition between grossular and hibschite (plazolite), 3CaO.Al₂O₃.2SiO₂2H₂O.

1861 H. W. Bristow Gloss. Mineral. 185/1 Hydrohalite... A hydrous chloride of sodium.

1949 Mineral. Abstr. X. 459 A drop of sea-water..evaporated at a low temperature..yields hexagonal flakes (¼ mm.) of hydrohalite, NaCl.2H₂O.

1928 C. Palache in Amer. Mineralogist 13 308 The following data establish the characters of unaltered hetaerolite. For the partly hydrated mineral hitherto described, the name hydrohetaerolite may well be employed.

1942 Amer. Mineralogist 27 50 It was..proposed by Palache to adopt Moore's name hetaerolite for the anhydrous mineral, analogous to hausmannite,..since this was the sense of the original definition. The actual material of Moore..was separated under the name hydrohetaerolite as a distinct species. The hydrous mineral from Leadville..also is to be classed as hydrohetaerolite.

1955 Amer. Mineralogist 40 350 Hydrohetaerolite has the same structure as hausmannite, except that one sixth of the trivalent manganese occupying the octahedral sites are randomly absent, and the balance of charge is supplied by hydrogen bonds.

1890 W. de W. Abney Treat. Photogr. (ed. 6) 24 It..produces hydroiodic acid (HI).

1883 A. E. Seaton Man. Marine Engin. xx. 376 (heading) Weir's hydrokineter.

1883 A. E. Seaton Man. Marine Engin. xx. 377 There are many other ways of promoting the circulation when steam is up, but none do this so efficiently during the time of raising steam as the hydrokineter.

1951 Engineering 20 Apr. 483/3 Surplus steam from the waste-heat boiler will be used..to keep the Scotch boilers warm and ready for service, Weir hydrokineters being fitted to the Scotch boilers to maintain a circulation.

1955 M. Hollander tr. P. H. Kuenen Realms Water v. 220 (caption) Hydrolaccolith or hummock caused when ground-water under artesian pressure is checked by formation of layers of ice.

1961 L. D. Stamp Gloss. Geogr. Terms 244/2 The pingos in East Greenland but not those in the Mackenzie delta are hydrolaccoliths.

1968 R. W. Fairbridge Encycl. Geomorphol. 845/2 The genetic term hydrolaccolith, which applies to all ice-intrusions, is not just synonymous with pingo.

1970 E. Watson tr. J. Tricart Geomorphol. Cold Environments ii. i. 78 These ice masses and the hills which they raise are called hydrolaccoliths.

1963 D. W. Humphries & E. E. Humphries tr. H. Termier & G. Termier Erosion & Sedimentation 412 An arctic soil phenomenon..formed in the permafrost by a hydrolaccolithic process.

1843 J. E. Portlock Rep. Geol. Londonderry 221 Hydrolite occurs in abundance at Island Magee, in beautifully marked crystals.

1837 J. D. Dana Syst. Mineral. 199 Hydromagnesite..occurs in crusts; also as a white powder.

1888 G. Rolleston & W. H. Jackson Forms Animal Life (ed. 2) 745 There are two principal types of the Hydroid. One, the Hydromedusan or Craspedote type, consists typically of an oral and stomachal region (hydrocephalis), with or without tentacles, borne upon a peduncle (hydrocope).

1890 Webster's Internat. Dict. Eng. Lang. Hydrometallurgical.

1929 Encycl. Brit. VI. 406/1 Hydro-metallurgical treatment..is eminently suited for low grade ores.

1959 J. Newton Extractive Metall. vii. 436 Hydrometallurgical methods are widely employed today in the treatment of low-grade oxidized uranium ores.

1879 F. Rutley Study of Rocks xii. 208 To admit for granite what may be called hydro-metamorphic origin.

1879 F. Rutley Study of Rocks xii. 208 Hydro-metamorphism, by which rocks, originally fused, and when in liquid fusion, poured into veins and dykes in pre-existing rocks, are subsequently altered in specific gravity and arrangement of minerals, by the action of water.

1857 J. P. Nichol Cycl. Physical Sci. Hydrometeors. The whole aqueous phenomena of the Atmosphere... The chief specific Hydrometeors, viz. Clouds, Dew, Fogs, Snow, and Rain.

1885 C. H. Hitchcock in Amer. Jrnl. Sc. Oct. 282 Hydromicaceous and argillaceous schists.

1938 M. Baldwin et al. in U.S. Dept. Agric. Yearbk. 991 The terms ‘halomorphic’, ‘hydromorphic’, and ‘calomorphic’ are not entirely satisfactory, since soil genetics rather than soil characteristics are implied.

1970 E. M. Bridges World Soils iii. 25/1 These poorly drained or hydromorphic soils frequently occur in the lower parts of the landscape.

1927 Russian Pedol. Investigations v. 26 Recently a single group has been formed which is..known by the name..of ‘hydromorphous’ soils (Neustruev).

1932 G. W. Robinson Soils xv. 301 Hydromorphous processes are those which take place under the influence of ground~water.

1886 Sci. Amer. 24 July 47/1 The little vessel supplied with the hydromotor met with a fair degree of success.

1889 A. Johnstone in Q. Jrnl. Geol. Soc. 45 364 Margarodite, gilbertite, damourite, and sericite are mineralogists' names for varieties possessing the same composition as muscovite, differing from the latter mineral merely in containing at least about 5 per cent. of water. All of these varieties..ought to be known under one term. The common name proposed for them by the Author is hydromuscovite.

1966 W. A. Deer et al. Introd. Rock-forming Minerals 202 Hydromuscovites have high H₂O and low K₂O content.

1881 A. Flint Treat. Princ. Med. (ed. 5) 716 A tumor, consisting of the serous accumulation with its enveloping membranes (hydromyelocele), protrudes through the fissure, most frequently in the sacral or dorsal regions.

1881 A. Flint Treat. Princ. Med. (ed. 5) 759 Dilatation of the central canal is called hydromyelus, and is generally congenital.

1823 W. Henry Elements Exper. Chem. (ed. 9) II. vii. 322 Hydro-nitric acid is perfectly limpid and colourless, and emits white fumes when exposed to the air.

1872 E. R. Peaslee Ovarian Tumors 28 ‘Ovarian dropsy’, or ‘hydro-ovarium’.

1823 W. Henry Elements Exper. Chem. (ed. 9) II. ix. 20 There appear to be two hydrates or hydro-oxides.

1834 T. Medwin Angler in Wales I. 95 Vermicular monsters exhibited in the hydro-oxygen microscope.

1840 Proc. Amer. Philos. Soc. 1838–40 1 14 Platinum fused by his hydro-oxygen blowpipe.

1854 J. Scoffern in Orr's Circle Sci., Chem. 298 Gurney's hydro-oxygen blowpipe is made in conformity.

1730 N. Bailey et al. Dictionarium Britannicum Hydroparastates,..a Sect, a branch of the Manichees, whose distinguishing Tenet was, that Water should be used in the Sacrament instead of Wine.

1853 M. Kelly tr. Gosselin Power of Pope I. 79 Manicheans who disguised themselves under the names of Encratides, Saccophori, and Hydroparastates.

1834 J. Forbes tr. R. T. H. Laennec Treat. Dis. Chest (ed. 4) 537 The lower extremities are œdematous... The same state exists in the serous membranes, whence arise ascites, hydrothorax, and hydropericardium.

1877 F. T. Roberts Handbk. Med. (ed. 3) II. 36 Hydropericardium generally follows hydrothorax.

1866 A. Flint Treat. Princ. Med. 456 The term hydro-peritoneum denotes peritoneal dropsy.

1864 Webster's Amer. Dict. Eng. Lang. Hydrophid, a species of ophidian, including the water-snake.

1899 D. Sharp in Cambr. Nat. Hist. VI. v. 219 The pupae of Hydrophilides repose on the dorsal surface.

1958 F. Balfour-Browne Brit. Water Beetles III. 3 The mandibles of Hydrophilus also differ from..those of all our other Hydrophilids.

1964 R. M. Fox & J. W. Fox Introd. Compar. Entomol. iii. 73 The hindleg of the hydrophilid beetle is provided with a fringe of hairs.

1873 H. Watts Fownes's Man. Elem. Chem. (ed. 11) 826 Hydrophthalic acid..is produced by the action of nascent hydrogen on phthalic acid.

1861 J. R. Greene Man. Animal Kingdom II. 101 Groups of organs became detached from the cœnosarc, each group consisting of a hydrophyllium, polypites, tentacles, and gonophores.

1753 Chambers's Cycl. Suppl. Hydrophysocele, a term used by some authors for a sort of hernia, or rupture, occasioned by a mixture of water and flatulencies.

1927 J. G. Tarboux Electr. Power Equipm. ii. 31 High-voltage transmission lines must be used to connect the hydro plant to the load center.

1966 McGraw-Hill Encycl. Sci. & Technol. (rev. ed.) XIV. 399/2 Installed capacity of hydroplants cannot be counted upon for perpetuity because of the gradual filling of reservoirs with sediment.

1878 P. H. Lawrence tr. B. von Cotta Rocks Classified (new ed.) 380 Plutonic processes do not exclude the combined action of water as an auxiliary agent; and thus may deserve the name of Hydroplutonic.

1876 J. Harley Royle's Man. Materia Med. (ed. 6) 316 Hydropotassic Oxalate is the form in which oxalic acid exists in the acid species of Oxalis, Rumex, Rheum, Geranium [etc.].

1866 R. D. Blackmore Cradock Nowell li A sail which they wetted with a hydro~pult.

1879 W. L. Lindsay Mind in Lower Animals 462 The elephant makes a similar use of his trunk as a syringe or hydropult, and of water as a projectile.

1866 R. D. Blackmore Cradock Nowell lxiii He had not acquired the delightful hydro~pultic art, so dear to the nation.

1886 New Sydenham Soc. Lexicon Hydrorenal distension, same as Hydronephrosis.

1861 J. R. Greene Man. Animal Kingdom II. 29 In Hydra, and a few of the simpler forms of Corynidæ, the proximal end of the polypite is closed by the hydrorhiza.

1870 G. Rolleston Forms Animal Life 253 The animal is..attached by its hydrorhiza to a piece of weed.

1866 A. Flint Treat. Princ. Med. 541 A dropsical accumulation within the spinal canal is called Hydrorachis.

1887 Lancet 11 June 1200/2 Dr. Schlesinger concludes that in hydrosalpinx, or hæmatosalpinx, laparotomy is the only..resource.

1768 Philos. Trans. 1767 (Royal Soc.) 57 293 An Account of an Hydro-enterocele, appearing like an Hydro-sarcocele.

1854 J. Scoffern in Orr's Circle Sci., Chem. 354 So does hydroselenic acid afford parallel results.

1823 W. Henry Elements Exper. Chem. (ed. 9) I. viii. 437 A hydro-selenuret of potash of a deep ale colour.

1926 A. G. Tansley & T. F. Chipp Aims & Methods Study Vegetation ii. 19 The earlier stages of a prisere are altogether different, according to whether the succession begins on a wet or a dry habitat... Such successions may be conveniently called hydroseres and xeroseres respectively.

1952 P. W. Richards Trop. Rain Forest Xiii. 283 During the course of the hydrosere there is a gradual change from open water to relatively dry conditions.

1967 C. D. Sculthorpe Biol. Aquatic Vasc. Plants xii. 417 In the ultimate stages of the hydroseres plant debris is less and less completely decomposed.

1850 C. G. B. Daubeny Introd. Atomic Theory (ed. 2) xii. 409 The silicates that contain water may be divided, into those in which the water is simply united to the silicic combination..called hydrosilicates.

1952 Jrnl. Royal Aeronaut. Soc. 56 334/2 Somewhat allied to the hydrofoil is the hydro-ski. These obtain their lift from the water pressure on their lower surface in a similar manner to the planing lift of the [flying] boat planing bottom.

1954 Flight 17 Sept. 433 The Sea Dart hydro-ski fighter..which is land-based, but which uses water (or snow or ice) for take-off and landing.

1960 K. C. Barnaby Basic Naval Archit. (ed. 3) 448 Modifications of the submerged type consist in replacing the forward hydrofoils by partly submerged planing surfaces or ‘hydroskis’.

1964 Adv. Hydro-science I. 2 The use of acoustic energy to perform all those functions in hydrospace for which electromagnetic energy is employed in aerospace.

1966 New Scientist 22 Dec. 691/1 Other categories of plot [in science fiction] include a growing preoccupation with ‘inner space’ or ‘hydrospace’.

1890 H. Ellis Criminal iii. 122 With the sphygmograph (or, rather the hydrosphygmograph) he observed the degree of excitement produced on various individuals.

1869 E. Billings in Amer. Jrnl. Sci. 98 76 In order to avoid the use of double terms, I propose to call them ‘hydrospires’.

1869 E. Billings in Amer. Jrnl. Sci. 98 77 In Caryocrinus ornatus there are thirty hydrospires.

1888 G. Rolleston & W. H. Jackson Forms Animal Life (ed. 2) 577 (Class Blastoidea). The pores lead to a cleft (hydrospire cleft)..and the cleft in its turn to an underlying hydrospire canal, into which open a system of interradial lamellar tubes, the hydrospires.

1888 G. Rolleston & W. H. Jackson Forms Animal Life (ed. 2) 578 The genital ducts probably opened into some portion of the hydrospires.

1879 F. Rutley Study of Rocks xiii. 270 To them..may be added chromic iron..hydrotalcite, native copper, copper pyrites.

1893 Times 6 Oct. The most famous hydrotechnic authorities of our time have found no other method of overcoming the obstruction to navigation caused by the Iron Gate than the identical one adopted by the Romans.

1897 Geogr. Jrnl. 10 619 As to the physics of running water, hydrotechnologists have recognized the dependence of velocity on the declivity of the water surface and depth.

1902 Encycl. Brit. XXV. 374/2 In Arizona, Mexico, and Peru reservoirs and aqueducts prove that hydrotechny was understood.

1847 J. Craig New Universal Dict. Hydrotellurates, a genus of salts.

1864 Webster's Amer. Dict. Eng. Lang. Hydrotelluric.

1868 H. B. Jones & H. Watts Fownes's Man. Elem. Chem. (ed. 10) 224 Hydrotelluric acid..is a gas, resembling sulphuretted and selenietted hydrogen.

1872 H. A. Nicholson Man. Palæontol. 77 Polypites are also protected within ‘hydrothecæ’, or little cup-like expansions derived from the polypary.

1877 T. H. Huxley Man. Anat. Invertebrated Animals iii. 129 A hard, chitinous, cuticular skeleton..which frequently gives rise to hydrothecae, into which the hydranths can be retracted.

1807 T. Thomson Syst. Chem. (ed. 3) II. 328 The Germans have given it [sulphuretted hydrogen] the name of hydrothionic acid.

1876 J. Van Duyn & E. C. Seguin tr. E. L. Wagner Man. Gen. Pathol. 576 Hydrothionæmia..consists in the entrance into the blood of sulphuretted hydrogen.

1913 Mineral. Mag. 16 362 Hydro~troilite.

1957 G. E. Hutchinson Treat. Limnol. I. xi. 723 The rather poorly characterized ferrous sulfide of lake sediments, supposedly FeS, has received the name hydro~troilite.

1940 Kerr & Young in Program & Abstr. 21st Ann. Meeting Min. Soc. Amer. 9 Since this mineral appears to be an intermediate product in the alteration of ferberite to tungstite and since it resembles tungstite in many of its physical properties, the name hydrotungstite is suggested.

1963 Amer. Mineralogist 48 935 A similarity between the x-ray patterns for hydrotungstite (tungstic acid, H₂WO₄.H₂O) and molybdic acid (H₂MoO₄.H₂O).

1955 Deep-sea Res. III. (Suppl.) 170 A jelly bottle..will remain uncongealed long enough to permit slope determinations to be made of hydrowires.

1969 R. Lange Chem. Oceanogr. v. 80 The sampler is attached to the hydrowire with a screw clamp and a snap clamp.