The Collaborative International Dictionary of English v.0.48:

Reticle \Ret"i*cle\, n. [See Reticule.]
   1. A small net.
      [1913 Webster]

   2. A reticule. See Reticule, 2. [R.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

reticle
    n 1: a network of fine lines, dots, cross hairs, or wires in the
         focal plane of the eyepiece of an optical instrument [syn:
         reticle, reticule, graticule]