monoheterosexual adjective 1noun 1forms 3 adjective1 •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.) noun1 •A person who is attracted solely to others of the opposite sex. formsmonoheterosexuals · more monoheterosexual · most monoheterosexual