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heterosexual (adj.)

1892, in C.G. Craddock's translation of Krafft-Ebbing's "Psychopathia Sexualis," a hybrid; see hetero- "other, different" + sexual. The noun is recorded by 1914 but was not in common use until the 1960s. Colloquial shortening hetero is attested from 1933.

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Definitions of heterosexual from WordNet
1
heterosexual (n.)
a person having a sexual orientation to persons of the opposite sex;
Synonyms: heterosexual person / straight person / straight
2
heterosexual (adj.)
sexually attracted to members of the opposite sex;
From wordnet.princeton.edu