| 释义 |
‖ tegmen|ˈtɛgmɛn|
Pl. ˈtegmina.
[L. tegmen (tegimen, tegumen) covering, f. teg-ĕre to cover; so F. tegmen.]
A cover, covering, coating, integument. (Only in scientific use.) a. gen.
1807J. Headrick Arran 61 The pitchstone assumes a greyish tegmen, or crust, by exposure to the air.
b. Entom. (pl.) The wing-covers, i.e. the fore wings when modified so as to serve as coverings for the hind wings; esp. those of orthopterous insects (corresponding to the elytra of beetles).
1817Kirby & Sp. Entomol. xxiii. (1818) II. 350 Probably in the next order (Orthoptera), the Tegmina, or wing-covers..assist them in flying. 1826Ibid. xlvii. IV. 371 The horizontal portion of one tegmen lies longitudinally over that of the other. 1877Huxley Anat. Inv. Anim. vii. 400 The female [cockroach] has moveable tegmina.
c. Bot. The thin inner coat of a seed, immediately enveloping the nucleus; the endopleura.
[1832Lindley Introd. Bot. 183 The internal integument,..endopleura of De Candolle, hilofère and tegmen of Mirbel.] 1857Henfrey Bot. §296 The inner integument, the tegmen or endopleura, is not generally distinguishable.
d. Anat. tegmen tympani, a plate of bone forming the roof of the tympanum of the ear, being a part of the temporal bone. Also ellipt. as tegmen.
1890in Billings Nat. Med. Dict. 1902D. J. Cunningham Text-bk. Anat. 704 The roof [of the tympanic cavity]..is formed by a thin plate of bone, the tegmen tympani. 1939Joyce Finnegans Wake 249 There lies her word, you reder!.. It vibroverberates upon the tegmen. 1977Proc. R. Soc. Med. LXX. 821/2 In mandibulofacial dysostosis the attic and antrum are typically absent..being replaced..by descent of the tegmen. 1980Gray's Anat. (ed. 36) 312/1 In a young skull the suture between the petrous and the squamous parts of the temporal bone may be visible at the lateral limit of the tegmen tympani.
e. Ornith. (pl.) = tectrices: see tectrix.
1891in Cent. Dict. |