GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Nictitate , v. i. [See Nictate.] To wink; to nictate.
   1913 Webster
   Nictitating membrane (Anat.), a thin membrane, found in many animals at the inner angle, or beneath the lower lid, of the eye, and capable of being drawn across the eyeball; the third eyelid; the haw.
   1913 Webster