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.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/nictitating%20membrane. Accessed 26 Feb. 2021.
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Time Traveler for nictitating membrane
The first known use of nictitating membrane was in 1713
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