CROSSBREEDING
miscegenation, crossbreeding, interbreeding
(noun) reproduction by parents of different races (especially by white and non-white persons)
hybridization, hybridisation, crossbreeding, crossing, cross, interbreeding, hybridizing
(noun) (genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids
Source: WordNet® 3.1
Verb
crossbreeding
present participle of crossbreed
Noun
crossbreeding (countable and uncountable, plural crossbreedings)
The process, or the result of crossbreeding
Source: Wiktionary
CROSSBREED
Cross"breed` (-brd`), n.
1. A breed or an animal produced from parents of different breeds; a
new variety, as of plants, combining the qualites of two parent
varieties or stocks.
2. Anything partaking of the natures of two different things; a
hybrid.
Source: Webster’s Unabridged Dictionary 1913 Edition