Definition of Ambiguous genitalia

Ambiguous genitalia: Genitalia that are neither typically female nor typically male. Also known as intersexual genitalia.

Girls (with a 46, XX chromosome constitution) can have virilized genitalia due to excess androgen action. Conversely, the genitalia in boys (with a 46, XY chromosome constitution) can appear undermasculinized or frankly feminized because of lack of androgen action.