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nictitating membrane


from The American HeritageĀ® Dictionary of the English Language, 4th Edition

  • n. A transparent inner eyelid in birds, reptiles, and some mammals that closes to protect and moisten the eye. Also called third eyelid.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. a transparent protective fold of skin acting as an inner eyelid in birds, reptiles and some mammals

from the GNU version of the Collaborative International Dictionary of English

  • intransitive v. a thin membrane, found in many animals at the inner angle, or beneath the lower lid, of the eye, and capable of being drawn across the eyeball; the third eyelid; the haw.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a protective fold of skin in the eyes of reptiles and birds and some mammals


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