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

First Known Use of nictitating membrane

1713, in the meaning defined above

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The first known use of nictitating membrane was in 1713

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Cite this Entry

“Nictitating membrane.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/nictitating%20membrane. Accessed 18 January 2020.

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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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