Source : Webster's Revised Unabridged Dictionary (1913)

Winker \Wink"er\, n.
   1. One who winks. --Pope.

   2. A horse's blinder; a blinker.

Source : WordNet®

winker
     n 1: a person who winks
     2: blind consisting of a leather eye-patch sewn to the side of
        the halter that prevents a horse from seeing something on
        either side [syn: {blinker}, {blinder}]