Source : Webster's Revised Unabridged Dictionary (1913)

Interbreed \In`ter*breed"\, v. t. & i.
   To breed by crossing different stocks of animals or plants.

Source : WordNet®

interbreed
     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: {crossbreed},
          {cross}, {hybridize}, {hybridise}]
     [also: {interbred}]