duct, epithelial duct, canal, channel - a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance; "the tear duct was obstructed"; "the alimentary canal"; "poison is released through a channel in the snake's fangs"

male reproductive system - the reproductive system of males

ballock, bollock, testicle, testis, orchis, egg, ball, nut - one of the two male reproductive glands that produce spermatozoa and secrete androgens; "she kicked him in the balls and got away"

seminal duct - the efferent duct of the testis in man