heterosis

het·er·o·sis

noun \ˌhet-ə-ˈrō-səs\

plural het·er·o·ses \-ˌsēz\

Definition of HETEROSIS

: a marked vigor or capacity for growth that is often shown by crossbred animals or plants—called also hybrid vigor

—het·er·ot·ic \-ˈrät-ik\ adjective