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hetero- Definition

hetero·- (het′ər ō′, -ə)

other, another, different heterosexual
also, before a vowel, heter-

Etymology: Gr hetero-, other, different < heteros, the other (of two), earlier hateros < IE *sm-tero- < base *sem-, *sm-, one, together > L semper, simplus + *-tero-, expressing contrast, comparison