Source : WordNet®

interbreeding
     n 1: (genetics) the act of mixing different species or varieties
          of animals or plants and thus to produce hybrids [syn: {hybridization},
           {hybridisation}, {crossbreeding}, {crossing}, {cross},
          {hybridizing}]
     2: reproduction by parents of different races (especially by
        white and non-white persons) [syn: {miscegenation}, {crossbreeding}]