nictitating-membrane

nictitating membrane

noun
a thin membrane, or inner or third eyelid, present in many animals, capable of being drawn across the eyeball, as for protection.

Origin:
1705–15; nictate + -ing2

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World English Dictionary
nictitating membrane (ˈnɪktɪˌteɪtɪŋ)
 
n
third eyelid, Also called: haw (in reptiles, birds, and some mammals) a thin fold of skin beneath the eyelid that can be drawn across the eye

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
nictitating membrane   (nĭk'tĭ-tā'tĭng)  Pronunciation Key 
A transparent inner eyelid in birds, reptiles, amphibians, and some mammals that protects and moistens the eye without blocking vision.
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