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1. (n.) nictitating membrane
a thin membrane, present in many animals, that can be drawn across the eyeball for protection.
Etymology: (1705–15)
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| Definition of 'nictitating membrane' |
Princeton's WordNet |
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1. (noun) nictitating membrane, third eyelid
a protective fold of skin in the eyes of reptiles and birds and some mammals
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| Definition of 'nictitating membrane' |
U.S. National Library of Medicine |
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1. nictitating membrane
A fold of the mucous membrane of the CONJUNCTIVA in many animals. At rest, it is hidden in the medial canthus. It can extend to cover part or all of the cornea to help clean the CORNEA.
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Definitions of nictitating membrane 
