Definition of nictitating membrane
: a thin membrane found in many vertebrates at the inner angle or beneath the lower lid of the eye and capable of extending across the eyeball
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First Known Use of nictitating membrane
1713
Medical Dictionary
nictitating membrane
medical Definition of nictitating membrane
: a thin membrane found in many vertebrate animals at the inner angle or beneath the lower lid of the eye and capable of extending across the eyeball — called also
membrana nictitans, third eyelid
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