I. |hed.ərō+ adjective
Etymology: International Scientific Vocabulary heter- + sexual
1. : of or relating to or characterized by heterosexuality
sexual relationships between individuals of opposite sexes are heterosexual — A.C.Kinsey
— opposed to homosexual
2. : of or relating to different sexes
heterosexual twins
a heterosexual flock of chickens — Anatomical Record
the pairing off … is seldom heterosexual — A.J.Liebling
II. noun
( -s )
: a heterosexual individual