INTERBREED
crossbreed, cross, hybridize, hybridise, interbreed
(verb) 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”
Source: WordNet® 3.1
Etymology
Verb
interbreed (third-person singular simple present interbreeds, present participle interbreeding, simple past and past participle interbred)
To breed or reproduce within an isolated community.
To breed or reproduce within a heterogenous community, the products of which produce hybrids.
Source: Wiktionary
In`ter*breed", v. t. & i.
Definition: To breed by crossing different stocks of animals or plants.
Source: Webster’s Unabridged Dictionary 1913 Edition