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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nictitating membrane

noun

: 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