Definition of "nictitating" []

• Winking, blinking (adjective)
• Present participle of nictitate. (verb)

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• "The eagle has what is really a third eyelid, a thin translucent membrane, which naturalists call the nictitating, or winking, membrane."
• "In addition to these it is defended by a third eyelid, called the nictitating eyelid, which is similar to that one which may be seen (if watched for) so frequently and rapidly to cross the eye of birds, e.g. of a hawk."
• "For example, throughout the vertebrated series, from fish to mammals, there occurs in the inner corner of the eye a semi-transparent eye-lid, which is called the nictitating membrane."