| 释义 |
‖ labrum|ˈleɪbrəm|
Pl. labra.
[L., cogn. w. labium.]
A lip or lip-like part. (Cf. labium.) a. In insects, crustaceans, etc.: A part forming the upper border or covering of the mouth. b. Conch. The outer lip of a univalve shell.
1816T. Brown Elem. Conchol. 154 Labra, the lip. 1826Kirby & Sp. Entomol. IV. 381 In the Ephemerina the parts of the mouth except the labrum and palpi appear to be mere rudiments. 1834McMurtrie Cuvier's Anim. Kingd. 301 A mouth composed of a labrum, two mandibles, a ligula, and one or two pairs of jaws, and branchiæ. 1849Murchison Siluria x. (1867) 237 [Pterygotus] The mouth..protected by a large heart-shaped labrum. 1851Richardson Geol. viii. 240 The labrum, or outer lip..is the expansion, or continuation of the body of the shell, on the right margin of the aperture. 1880Huxley Cray-Fish ii. 51 In front, the mouth is overlapped by a wide shield-shaped plate termed the upper lip or labrum. |