The Collaborative International Dictionary of English v.0.48:

Twinkler \Twin"kler\, n.
   One who, or that which, twinkles, or winks; a winker; an eye.
   [1913 Webster]

WordNet (r) 3.0 (2006):

twinkler
    n 1: an object that emits or reflects light in an intermittent
         flickering manner