| 释义 |
univalve, a. and n. Nat. Hist.|ˈjuːnɪvælv|
[See uni- and valve n.1 Cf. F. univalve (1752), It. and Pg. univalve, It. and Sp. univalvo, mod.L. univalvis.]
A. adj.
a. Conch. Of molluscs: Having a shell consisting of one valve. Of shells: Composed of a single valve or piece.
1661Lovell Hist. Anim. & Min. A 7 b, Fishes, which..are, turbinate,..bivalve,..or univalve. 1752J. Hill Hist. Anim. 115 The first [series of shellfish] containing those formed of only one piece; this I shall call the simple ones; others have called them univalve ones. 1774Phil. Trans. LXV. 46 The smallest univalve or testaceous animal of any such kind. 1816W. Smith Strata Ident. 27 Bivalve shells [are] most common to the thick beds; univalve to the thin. 1851G. F. Richardson Geol. viii. 230 When they have a shell it is thin, fragile, and univalve. 1872W. S. Symonds Rec. Rocks vi. 181 A univalve mollusk.
b. Ent. Having one valve.
Also in recent use in Zool. and Bot.
1826G. Samouelle Direct. Collect. 54 Proboscis [of Diptera] (rarely wanting) univalve.
B. n. Conch. A univalve mollusc or shell.
1668Wilkins Real Char. 129 Venus Shell..being of near affinity to the Univalvs. 1683Phil. Trans. XIV. 507 Distinction of shells into Univalves, Bivalves, and Turbinated. 1755Gentl. Mag. XXV. 32/2 When a shell, therefore, is found to be a Univalve. 1785Phil. Trans. LXXV. 342 The univalves..have the intestine reflected back. 1832Lyell Princ. Geol. II. 110 Aquatic univalves usually attach their eggs to leaves and sticks. 1854Kingsley Lett. (1878) I. 411 The crevices of the highest rocks..have their peculiar little univalves. 1879tr. Sempter's Anim. Life 41 Animals..as low in the scale as the Amphibia or Univalves.
Hence uniˈvalved, uniˈvalvular adjs., Bot. having or consisting of one valve.
Also, in recent Dicts. (1891–), univalvate.
1823Crabb Technol. Dict., *Univalved,..one-valved; an epithet for a pericarp. 1857A. Gray First Less. Bot. (1866) 235 Univalved, a pod of only one piece after dehiscence.
1793Martyn Lang. Bot., Folliculus,..a follicle, a *univalvular pericarp. 1830Lindley Nat. Syst. Bot. 294 Those species of Panicum whose outer flower is univalvular. 1849Balfour Man. Bot. §530 The pericarp becomes divided into different pieces, which are denominated valves, the fruit being univalvular, bivalvular,..&c. according as there are one, two, or many valves. |