ductn.[L. ductus a leading, conducting, conduit, fr. ducere, ductum, to lead. See Duke, and cf. Douche.]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.(Hammond.)