English word heterosexual comes from English -sexual, English hetero- (Other, different.)

Detailed word origin of heterosexual

Dictionary entry	Language	Definition
-sexual	English (eng)	Forms a noun or adjective describing a state or style of sexuality.
hetero-	English (eng)	Other, different.
heterosexual	English (eng)	A heterosexual person, or other heterosexual organism. Sexually attracted to members of the opposite sex.

Words with the same origin as heterosexual