Source : Webster's Revised Unabridged Dictionary (1913)

Crossbreed \Cross"breed`\ (-br[=e]d`), n.
   1. A breed or an animal produced from parents of different
      breeds; a new variety, as of plants, combining the
      qualities of two parent varieties or stocks.

   2. Anything partaking of the natures of two different things;
      a hybrid.

Source : WordNet®

crossbreed
     n : an organism that is the offspring of genetically dissimilar
         parents or stock; especially offspring produced by
         breeding plants or animals of different varieties or
         breeds or species; "a mule is a cross between a horse and
         a donkey" [syn: {hybrid}, {cross}]
     v : breed animals or plants using parents of different races and
         varieties; "cross a horse and a donkey"; "Mendel tried
         crossbreeding"; "these species do not interbreed" [syn: {cross},
          {hybridize}, {hybridise}, {interbreed}]
     [also: {crossbred}]