nictitating membrane
noun
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
noun
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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