| 单词 |
frænulum |
| 释义 |
‖ frænulum Anat.|ˈfriːnjʊləm|
Also frenulum |ˈfrɛnjʊləm|.
[dim. of frænum.]
1. A small frænum; a frænum.
1706in Phillips (ed. Kersey). 1840Youatt Horse viii. (1847) 204 A portion of the tongue of a mare, extending as far as the frænulum beneath. 1843J. G. Wilkinson tr. Swedenborg's Anim. Kingd. I. ii. 59 Each of the lips has its peculiar frænulum.
2. Ent. A bristle or group of bristles attached to the base of the hind wing in many Lepidoptera, and interlocking with a process on the front wing, thus uniting the two wings of a side in flight. Hence ˈfrenate, ˈfrenular adjs.
1892G. F. Hampson Fauna Brit. India, Moths I. 6 The fore and hind wings of the majority of families of moths are united by a ‘frenulum’ arising from the base of the costa of the hind wing and fitting into a ‘retinaculum’ on the fore wing. 1898A. S. Packard Text-bk. Entomol. 122 In many Lepidoptera they [sc. the wings] are loosely connected by the loop and frenulum. 1925A. D. Imms Gen. Textbk. Entomol. iii. 418 Among Hetero⁓neura two main types of wing-coupling apparatus are also evident, viz: the frenate and the amplexiform. In the frenate type a sexual difference is very noticeable. 1969R. F. Chapman Insects viii. 175 Many other Lepidoptera have the frenulum well developed. Ibid., In Micropterygidæ the jugum is folded under the fore wings and holds the frenular bristles. |
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