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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Nictitating membrane is always a great word to know.
So is gobo. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a scrap or morsel of food left at a meal.
Collins
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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