mammiferous /mæˈmɪfəɹəs/ adjective2 •Mammalian.The moment of ejaculation in mammiferous animals is accompanied by universal excitement of the whole body, a kind of slight convulsion, which terminates in a comatose or exstatic state. — 1837 •Having mammae, or (humorous) breasts.The mammiferous secretary slithered in, changed the spool and slithered out again, giving me a small, hygienic smile en route. — 1973 formsmore mammiferous · most mammiferous