heroin n : a white odourless bitter-tasting crystalline powder derived from morphine: a highly addictive narcotic. formula: C17H17NO(C2H3O2)2 [probably from HERO, referring to its aggrandizing effect on the personality] heroine n : 1 a woman possessing heroic qualities. 2 a woman idealized for possessing superior qualities. 3 the main female character in a novel, play, film, etc. |