单词 | cyclic |
释义 | cyclicadj. 1. a. Of or pertaining to a cycle or cycles; of the nature of a cycle; revolving or recurring in cycles. ΘΚΠ the world > time > period > cycle of time > [adjective] cyclar1769 cyclic1794 cyclicala1834 1794 R. J. Sulivan View of Nature II. 226 The order he [Moses] has given his narrative is..conformable to the cyclic ideas of the people he lived amongst. 1840 E. B. Browning Drama of Exile While all the cyclic heavens about me spun. 1879 R. A. Proctor Pleasant Ways Sci. ii. 31 Cyclic associations between solar and terrestrial phenomena. b. Belonging to a definite chronological cycle. ΘΚΠ the world > time > period > cycle of time > [adjective] > belonging to a definite cycle cyclic1838 cyclical1838 1838 T. Arnold Hist. Rome I. xvii. 368 (note) Twenty cyclic years, of ten months each. 1850 C. P. Brown (title) Cyclic Tables of Chronology of the history of the Telugu and Kannadi countries (Madras). c. Characterized by recurrence in cycles. ΚΠ 1885 F. W. Pary in Lancet 17 Oct. 706 These cases..have a cyclic character belonging to them, and hence my adoption of the term Cyclic Albuminuria. 1886 Braithwaite's Retrosp. Med. XCIII. 219 A Physiological cyclic change. 1888 P. H. Pye-Smith Fagge's Princ. & Pract. Med. (ed. 2) II. 600 ‘Cyclic albuminuria’, by which is denoted the recurrence of traces of albumen in the urine at more or less regular intervals. d. Aeronautics. cyclic pitch control, a method of controlling the direction or motion of a helicopter by varying the angle of the rotor blades during each cycle of rotation. So cyclic pitch lever, cyclic stick. ΘΚΠ society > travel > air or space travel > action of flying (in) aircraft > specific flying operations or procedures > [noun] > method of control of helicopter cyclic pitch control1944 1944 H. F. Gregory Anything Horse can Do xiv. 145 The first and probably the most common [method of controlling helicopters]..is called cyclic pitch control. What it means is the change of pitch of a blade..as the blade moves in its cycle of rotation. 1959 F. D. Adams Aeronaut. Dict. 55/2 Cyclic pitch stick, a control stick for cyclic pitch control. 1962 Flight Internat. 81 865/2 According to the position of a pendulous ‘cyclic-pitch’ lever, the complete rotor disc and resulting lift vector can be tilted to control the flight path. 2. a. Of or belonging to a cycle of mythic and heroic story: see cycle n.1 6 Cyclic poet: one of the writers of the ‘Epic cycle’. ΘΚΠ society > leisure > the arts > literature > prose > narrative or story > legend or folk tale > [adjective] > cycle cyclica1822 cyclical1841 cyclian1847 society > leisure > the arts > literature > poetry > poet > poet by kind of poem > [noun] > epic or heroic poet > poet of epic cycle circlera1637 Cyclic poeta1822 a1822 P. B. Shelley Def. Poetry in Prose Wks. (1888) II. 20 They are the episodes of that cyclic poem written by Time upon the memories of men. 1840 G. C. Lewis tr. K. O. Müller Hist. Lit. Anc. Greece I. vi. 64 This class of [later] epic poets is called the Cyclic, from their constant endeavour to connect their poems with those of Homer, so that the whole should form a great cycle. 1868 W. E. Gladstone Juventus Mundi (1870) i. 11 The Cyclic Poems, which aimed at completing the circle of events with which they deal. b. transferred. Belonging to the cycle of current Greek tradition which underlies the Synoptic Gospels, as distinguished from what is peculiar to a single Synoptist. ΚΠ 1860 B. F. Westcott Introd. Study Gospels iv. 209/2 Cyclic quotations... In all these cases..parallels occur in the other Synoptic Gospels agreeing (as St. Matthew) with the LXX. 3. cyclic chorus [Greek κύκλιος χορός] in Ancient Greek History: the dithyrambic chorus, which was danced in a ring round the altar of Dionysus. ΘΚΠ society > faith > worship > observance, ritual > kinds of rite > dance > [noun] canticoy1670 snake dance1772 ritual dance1805 cyclic chorus1846 sun dance1849 Ghost Dance1876 kagura1884 kachina dance1888 Ghost Dancing1890 tripudium1909 ring-shout1926 trance dance1935 Shango1941 society > leisure > dancing > types of dance or dancing > dances of other countries > [noun] > Greece > ancient Greek cyclic chorus1846 1846 J. E. Worcester Universal Dict. Eng. Lang. Cyclic..noting a kind of verse or chorus, cyclical. Beck. 4. Botany. Of a flower: Having its parts arranged in whorls. ΚΠ 1875 A. W. Bennett & W. T. T. Dyer tr. J. von Sachs Text-bk. Bot. 565 In the great majority of Dicotyledons the parts of the flower are arranged in whorls, or the flowers are cyclic; only in a comparatively small number of families..are all or some of them arranged spirally (acyclic or hemicyclic). Categories » 5. Mathematics. Of or pertaining to a circle or cycle.spec. cyclic axis (of a cone of the second order): a line through the vertex perpendicular to the circular section of the cone (Booth, 1852) cyclic constant: the constant by which a many-valued function is increased after describing a non-evanescible circuit or cycle in a cyclic region (Maxwell Electr. & Magn. (1881) I. 18). cyclic planes (of a cone of the second order): the two planes through one of the axes which are parallel to the circular section of the cone (Salmon Analyt. Geom. Three Dim. (1874) 194). Sometimes used of any circular sections. cyclic quadrilateral: one inscribable in a circle (Casey Plane Trigonometry (1888) 184). cyclic region: a region or domain within which a closed line can be drawn in such a manner that it cannot shrink indefinitely without passing out of the region. 6. Ancient Greek Prosody. Of a dactyl or anapæst: Occupying in scansion only three ‘times’ instead of four; applied to dactyls which interchange, not (as in Hexameters) with spondees, but with trochees. ΘΚΠ society > leisure > the arts > literature > poetry > versification > metre > [adjective] > composed in feet > dactylic > shorter in morae cyclic1844 society > leisure > the arts > literature > poetry > versification > metre > [adjective] > composed in feet > anapaestic > shorter in morae cyclic1844 1844 C. Beck & C. C. Felton tr. E. Munk Metres Greeks & Romans 102 The cyclic anapæsts, so called, are analogous to the irrational dactyls. 1879 L. Campbell Sophocles I. Pref. 44 According to a doubtful theory the dactyls in logaoedic verse are each of them equivalent in time to a trochee, much as a triplet may be occasionally introduced in ordinary music without altering the time. Such a foot is called a ‘lyrical’ or ‘cyclic’ dactyl (ποὺς κύκλιος). 7. Organic Chemistry. Of a compound: having a molecular structure containing one or more ‘closed chains’ or rings of atoms; also, of or pertaining to such compounds. See also alicyclic adj. and n., carbocyclic adj. at carbo- comb. form 2, heterocyclic adj. and n., isocyclic adj. at iso- comb. form 1. ΘΚΠ the world > matter > chemistry > organic chemistry > organic compounds > [adjective] > cyclic compounds pentacyclic1875 cyclic1898 1898 Jrnl. Chem. Soc. 74 i. 637 It is extremely difficult to separate benzene from cyclic hydrocarbons boiling at a much lower temperature. 1913 A. G. Bloxam & S. J. Lewis Bloxam's Chem. (ed. 10) 544 The cyclic or closed-chain series. 1923 T. H. Pope tr. E. Molinari Treat. Org. Chem. II. 616 Cyclic compounds. 1937 Thorpe's Dict. Appl. Chem. (ed. 4) I. 33/2 Cyclic acetals, of use in perfumery and as industrial solvents, are made by condensing dihydric alcohols with unsubstituted araliphatic aldehydes. 1961 L. F. Fieser & M. Fieser Adv. Org. Chem. ii. 51 The hydrocarbon is indeed known, and since it has the same number of carbon atoms as propane but is cyclic it is called cyclopropane. Draft additions 1993 b. Algebra. Of a group: having the property that each element of the group may be expressed as a power of a particular element, sometimes called the generator (see generator n. 2b) of the group. ΘΚΠ the world > relative properties > number > mathematical number or quantity > numerical arrangement > [adjective] > of sets > in abstract algebra > of groups reducible1585 transitive1861 primitive1888 simple1888 special1888 cyclic1889 intransitive1889 solvable1892 finite1893 perfect1898 Abelian1900 soluble1902 proper1906 trivial1915 equivalent1948 hypercyclic1968 sporadic1968 1889 O. Bolza in Amer. Jrnl. Math. 11 205 The cyclic group of the order n can be generated by a single substitution a, satisfying the relation an = 1, and no other relation an′ = 1 where n′ < n. 1901 L. E. Dickson Linear Groups ii. xi. 252 G contains..such conjugate cyclic subgroups, all of whose substitutions are conjugate under G. 1940 C. C. MacDuffee Introd. Abstr. Algebra ii. 53 A cyclic group has as its elements the powers of a single generator. 1983 R. B. J. T. Allenby Rings, Fields & Groups v. 213 In the case of infinite cyclic groups the prototype is the group 〈ℤ ,+〉. Draft additions October 2011 cyclic AMP n. Biochemistry a form of the compound AMP (adenosine monophosphate) which plays an important regulatory role in many biochemical pathways and cellular processes, including acting as a second messenger; abbreviated cAMP.Cyclic AMP is a monophosphoric diester of adenosine; systematic name adenosine 3ʹ,5ʹ-phosphate. Cyclic AMP differs from ordinary AMP in having the phosphate group in a cyclic (ring) configuration. ΚΠ 1955 Biochimica et Biophysica Acta 17 528 (table) 2′ AMP..3′ AMP..5′ AMP..Cyclic AMP. 1968 Circulation 37 300/1 Cyclic AMP stands as the only well-established second messenger to date. 1989 Omni Aug. 18/3 Howlett wanted to see if the Pfizer cannabinoids worked the way some other analgesics do: by affecting a molecule called cyclic AMP. 2006 N.Y. Rev. Bks. 5 Oct. 20/4 Memory Pharmaceuticals..has four drugs in development, two of which exploit Kandel's cyclic AMP work to treat memory and psychiatric disorders. Draft additions September 2018 cyclic GMP n. Biochemistry cyclic guanosine monophosphate, either of the two monophosphoric diesters of guanosine; spec. guanosine 3ʹ,5ʹ-phosphate, which plays an important regulatory role in many biochemical pathways and physiological processes, often as a second messenger or enzyme regulator.In cyclic GMP the phosphate group is in a ring formation. ΚΠ 1963 Nucleic Acids II. i. 8 The amounts of the cyclic phosphates excreted daily were 18 μg/100 g body weight for cyclic AMP and somewhat less for cyclic GMP. 1989 B. Alberts et al. Molecular Biol. Cell (ed. 2) xii. 713 The signaling role of cyclic GMP is especially well understood in the response to light of rod cells in the vertebrate retina. 2008 Nature 31 Jan. p. ix The newly discovered quiescent behavioural state is regulated by a cyclic GMP signalling pathway. This entry has not yet been fully updated (first published 1893; most recently modified version published online March 2022). < adj.1794 |
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