| 释义 |
monocyclic, a.|mɒnəʊˈsɪklɪk, -ˈsaɪklɪk|
[Formed as prec. + -ic.]
Having a single circle or cycle.
1. Zool.
a. Of or pertaining to the Monocyclica, a subclass of crinoid Echinoderms having only a single circlet of basal plates.
b. Of or pertaining to the Monocyclia, a division of Holothurians having the tentacles in a single circle or series.
1882F. H. Carpenter in Q. Jrnl. Microsc. Sci. XXII. 377 The monocyclic Comatulæ. 1888Rolleston & Jackson Anim. Life 545 When they [sc. underbasals] are present the base of the apical system is said to be dicyclic, when absent monocyclic. 1900Lankester's Treat. Zool. III. 111 Monocyclic and dicyclic genera should not be placed in the same line of descent.
2. Bot.
a. Having the members of a floral series disposed in a single whorl.
b. Annual (B. D. Jackson Gloss. Bot. Terms 1900).
1882S. H. Vines tr. Sachs' Text-bk. Bot. 601 When the members of a series (calyx, corolla, etc.) are in one whorl, the series is said to be monocyclic. 1891Syd. Soc. Lex., Monocyclic, having the members of a series all in one whorl. 1895S. H. Vines Students' Text-bk. Bot. II. iii. 501 The simplest case is that in which each series of floral organs..occupies a single whorl, or is monocyclic.
3. Electr. ‘Designating a certain system or arrangement of armature windings and transmission lines for the utilization of currents in a combined lighting and power service’ (Webster Suppl. 1902).
4. Chem. Having a molecular structure with a single ring.
1910Jrnl. Chem. Soc. XCVII. 1616 From this glycol we could obtain a monocyclic terpene. 1939Nature 26 Aug. 349/1 The detailed consideration of monocyclic compounds is then taken up. 1967M. E. Hale Biol. Lichens viii. 105 Free monocyclic phenolic substances.
5. Geol. Having undergone a single cycle of erosion or (quot. 1969) of mountain-building.
1952Jrnl. Geol. LX. 188/1 Four general types of landscapes, suggested by Bryan's (1943, pp. 472–473) classification of soils: (1) simple, monocyclic landscapes which can be fitted to the idealized cycle; (2) complex, multicyclic landscapes which require historical interpretation; (3) compound landscapes..; (4) exhumed landscapes. 1954W. D. Thornbury Princ. Geomorphol. ii. 23 Monocyclic landscapes are less common than multicyclic and are in general restricted to such newly created land surfaces as a recently uplifted portion of the ocean floor. 1968R. W. Fairbridge Encycl. Geomorphol. 286/2 Monocyclic landscapes are rarely found except in very recently formed land surfaces. 1969Bennison & Wright Geol. Hist. Brit. Isles iii. 36 Within both the Caledonian and Lewisian belts there is evidence of several periods of folding and metamorphism and neither represents a simple monocyclic unit. |