The story
From mono- + heterosexual.
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: Sexually attracted only to other members of the opposite sex. Being either a male gynephile or a female androphile. (Always used in the sense of heterosexual not being bisexual.) Full definition →
From mono- + heterosexual.
Etymology from Wiktionary, CC BY-SA 4.0.