The Collaborative International Dictionary of English v.0.48:

Eyelash \Eye"lash`\, n.
   1. The fringe of hair that edges the eyelid; -- usually in
      the pl.
      [1913 Webster]

   2. A hair of the fringe on the edge of the eyelid.
      [1913 Webster]

WordNet (r) 3.0 (2006):

eyelash
    n 1: any of the short curved hairs that grow from the edges of
         the eyelids [syn: eyelash, lash, cilium]