Source : Webster's Revised Unabridged Dictionary (1913)

Binocular \Bin*oc"u*lar\, a. [Cf. F. binoculaire. See
   {Binocle}.]
   1. Having two eyes. ``Most animals are binocular.'' --Derham.

   2. Pertaining to both eyes; employing both eyes at once; as,
      binocular vision.

   3. Adapted to the use of both eyes; as, a binocular
      microscope or telescope. --Brewster.

Binocular \Bin*oc"u*lar\, n.
   A binocular glass, whether opera glass, telescope, or
   microscope.

Source : WordNet®

binocular
     adj : relating to both eyes; "binocular vision"

binocular
     n : an optical instrument designed for simultaneous use by both
         eyes [syn: {binoculars}, {field glasses}, {opera glasses}]