ˌhed.əˈrōsə̇s noun
( plural hetero·ses -ōˌsēz)
Etymology: New Latin, from Greek heterōsis alteration, alteration of heteroiōsis, from heteroioun to alter (from heteroios different in kind, from heteros other) + -ōsis -osis — more at heter-
: a greater vigor or capacity for growth frequently displayed by crossbred animals or plants as compared with those resulting from inbreeding