Source : Webster's Revised Unabridged Dictionary (1913)

Nictate \Nic"tate\, v. i. [L. nictare, nictatum, from nicere to
   beckon.]
   To wink; to nictitate.

Source : WordNet®

nictate
     v : briefly shut the eyes; "The TV announcer never seems to
         blink" [syn: {blink}, {wink}, {nictitate}]