单词	nictitating membrane
释义	nictitating membrane noun : 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 Word History First Known Use 1713, in the meaning defined above Medical Definition 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
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