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单词 nictitating membrane
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nictitating membrane
nictitating membrane n. a whitish or translucent membrane that forms an inner eyelid in birds, reptiles, and some mammals, and which can be extended across the eye to keep it moist and protect it from dust, etc. (also called third eyelid).
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the world > animals > animal body > general parts > head and neck > [noun] > third or inner eyelid
haw?1523
nictating membrane1678
nictitating membrane1713
third eyelid1822
1713*Nictitating membrane [see main sense].
1774 O. Goldsmith Hist. Earth VII. 209 The eye [of the rattlesnake] also is furnished with a nictitating membrane, that preserves it from dust.
1822 J. M. Good Study Med. III. 19 In the elephant, oppossum, seal, cat kind, and various other mammals, all birds, and all fishes we find a third eye-lid, or nictitating membrane as it is usually called.
1845 N. P. Willis Dashes at Life with Free Pencil iv. 138 Chambermaids and nurses; who, by the way they flock to the beach in the male hours, must either have eyes with a nictitating membrane, or a modesty that is confined to what they hear.
1882 Cent. Mag. Dec. 233/1 Should the nictitating membrane protrude, it should be pressed back with the point of the lancet.
1900 Contemp. Rev. 78 217 There was this monster [sc. a shark] sheering off and along by her side, and working its white nictitating membrane off and on its eyes.
1994 J. Updike Brazil x. 81 When he closed his eyelids, the fine vein-webbed skin just below them twitched, like the nictitating membrane of a frog.
extracted from nictitatingadj.
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