The Collaborative International Dictionary of English v.0.48:

Toucan \Tou"can\ (t[=oo]"k[a^]n; 277), n. [F., fr. Pg. tucano;
   from Brazilian name. ]
   1. (Zool.) Any one of numerous species of fruit-eating birds
      of tropical America belonging to Ramphastos,
      Pteroglossus, and allied genera of the family
      Ramphastidae. They have a very large, but light and
      thin, beak, often nearly as long as the body itself. Most
      of the species are brilliantly colored with red, yellow,
      white, and black in striking contrast.
      [1913 Webster]

   2. (Astronom.) A modern constellation of the southern
      hemisphere.
      [1913 Webster]

WordNet (r) 3.0 (2006):

toucan
    n 1: brilliantly colored arboreal fruit-eating bird of tropical
         America having a very large thin-walled beak