Noun | 1. | ![]() 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" apparatus urogenitalis, genitourinary apparatus, genitourinary system, systema urogenitale, urinary apparatus, urinary system, urogenital apparatus, urogenital system - the system that includes all organs involved in reproduction and in the formation and voidance of urine urinary tract - the organs and tubes involved in the production and excretion of urine |