INTERBRED
interbred
(adjective) bred of closely related parents
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
interbred
simple past tense and past participle of interbreed
Source: Wiktionary
INTERBREED
In`ter*breed", v. t. & i.
Definition: To breed by crossing different stocks of animals or plants.
Source: Webster’s Unabridged Dictionary 1913 Edition