The Collaborative International Dictionary of English v.0.48:

Binocular \Bin*oc"u*lar\, a. [Cf. F. binoculaire. See
   Binocle.]
   1. Having two eyes. "Most animals are binocular." --Derham.
      [1913 Webster]

   2. Pertaining to both eyes; employing both eyes at once; as,
      binocular vision.
      [1913 Webster]

   3. Adapted to the use of both eyes; as, a binocular
      microscope or telescope. --Brewster.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Binocular \Bin*oc"u*lar\, n.
   A binocular glass, whether opera glass, telescope, or
   microscope.
   [1913 Webster]

WordNet (r) 3.0 (2006):

binocular
    adj 1: relating to both eyes; "binocular vision"