Noun

• S: (n) hybridization, hybridisation, crossbreeding, crossing, cross, interbreeding, hybridizing ((genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids)
• S: (n) miscegenation, crossbreeding, interbreeding (reproduction by parents of different races (especially by white and non-white persons))

Verb

• S: (v) crossbreed, cross, hybridize, hybridise, interbreed (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"