| n. | 1. | Any tube or canal by which a fluid or other substance is conducted or conveyed. |
| 2. | (Anat.) One of the vessels of an animal body by which the products of glandular secretion are conveyed to their destination. | |
| 3. | (Bot.) A large, elongated cell, either round or prismatic, usually found associated with woody fiber. | |
| 4. | Guidance; direction. |
| Noun | 1. | duct - 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" |
| 2. | duct - a continuous tube formed by a row of elongated cells lacking intervening end walls | |
| 3. | duct - an enclosed conduit for a fluid |