tri·hybrid \(ˈ)trī+\noun Etymology:tri- + hybrid 1.: an individual or strain heterozygous for three factors and especially for three recessive genes 2.: an individual or strain resulting from the interbreeding of three distinct kinds of individuals < held the Australian aborigines to be trihybrids formed by admixture of Negrito and two distinct Australoid elements > • tri·hybrid·ism\“+\noun