duct > define

noun

• A bodily passage or tube lined with epithelial cells and conveying a secretion or other substance.
  • usage: "the tear duct was obstructed"; "the alimentary canal"; "poison is released through a channel in the snake's fangs"
  • synonyms: epithelial duct, canal, channel
• A continuous tube formed by a row of elongated cells lacking intervening end walls.
• An enclosed conduit for a fluid. .

• (n.) Any tube or canal by which a fluid or other substance is conducted or conveyed.
• (n.) One of the vessels of an animal body by which the products of glandular secretion are conveyed to their destination.
• (n.) Guidance; direction.
• (n.) A large, elongated cell, either round or prismatic, usually found associated with woody fiber.