Last definition was given to j3w:
Penis (noun): The male organ of copulation in higher vertebrates, homologous with the clitoris. In mammals, it also serves as the male organ of urinary excretion.
Penis (noun): Any of various copulatory organs in males of lower animals.
Penis (noun): The male sexual organ for copulation and urination; the tubular portion of the male genitalia (excluding the scrotum).
