hetero UK /ˈhɛt.(ə).ɹoʊ/US /ˈhɛ.tɚ.oʊ/adjective 1noun 1forms 3 adjective1 •(informal) Heterosexual: of, pertaining to, or being a heterosexual person.This novel depicts a hetero couple who are in love. noun1 •(informal) A heterosexual person.You only have to watch Dominic West’s dancing in the film Pride for two seconds to understand that there are some things beyond a hetero’s range. — 2018 formsheteros · more hetero · most hetero