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nictitating membrane

The Oxford Pocket Dictionary of Current English | 2009 | Copyright

nic·ti·tat·ing mem·brane / ˈniktiˌtāting/ • n. Zool. a whitish or translucent membrane that forms an inner eyelid in birds, reptiles, and some mammals. It can be drawn across the eye to protect it from dust and keep it moist. Also called third eyelid.

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nictitating membrane

A Dictionary of Zoology | 1999 | | Copyright

nictitating membrane In some vertebrates, a lid-like membrane that is attached to the anterior corner of the eye. When drawn across the eye it reduces illumination of the retina. It is common in Reptilia and Aves, and present in some Mammalia and in many sharks (e.g. those of the family Carcharhinidae).

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MICHAEL ALLABY. "nictitating membrane." A Dictionary of Zoology. 1999. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "nictitating membrane." A Dictionary of Zoology. 1999. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1O8-nictitatingmembrane.html

MICHAEL ALLABY. "nictitating membrane." A Dictionary of Zoology. 1999. Retrieved June 01, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O8-nictitatingmembrane.html

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nictitating membrane

A Dictionary of Biology | 2004 | Copyright

nictitating membrane A clear membrane forming a third eyelid in amphibians, reptiles, birds, and some mammals (but not humans). It can be drawn across the cornea independently of the other eyelids, thus clearing the eye surface and giving added protection without interrupting the continuity of vision.

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"nictitating membrane." A Dictionary of Biology. 2004. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1O6-nictitatingmembrane.html

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