kɹɒs kɹɔs ˈkɹɔsɪŋ ˈkɹɒsɪŋ haɪ.bɹɪd.aɪˈzeɪ.ʃən mɪˌsɛdʒ.əˈneɪ.ʃən reproduction by parents of different races (especially by white and non-white persons) (genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids