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nictitating membrane

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Membrane nictitating
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nictitating membrane

 
Use nictitating membrane in a Sentence
–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 + -ing 2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Membrane nictitating
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nic·ti·tat·ing membrane   (nĭk'tĭ-tā'tĭng)   
n.  A transparent inner eyelid in birds, reptiles, and some mammals that closes to protect and moisten the eye. Also called third eyelid.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: nictitating membrane
Function: noun
: a thin membrane found in many vertebrate animals at the inner angle or beneath the lower lid of the eye and capable ofextending across the eyeball called also membrana nictitans, third eyelid
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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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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