duct

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. An often enclosed passage or channel for conveying a substance, especially a liquid or gas.
2. n. Anatomy A tubular bodily canal or passage, especially one for carrying a glandular secretion: a tear duct.
3. n. A tube or pipe for enclosing electrical cables or wires.
4. v. To channel through a duct: duct the moist air away.
5. v. To supply with ducts.

Century Dictionary and Cyclopedia

1. n. Leading; guidance; direction; bearing.
2. n. Any tube or canal by which a fluid is conducted or conveyed. Specifically— In anatomy, one of the vessels of an animal body by which the blood, chyle, lymph, secretions, etc., are conveyed. See ductus.
3. n. In bot.:
4. n. A long continuous vessel or canal, formed by a row of cells which have lost their intervening partitions. The walls are variously marked by pits and by spiral, annular, or reticulated thickenings, and the cavity may be filled with air or water, or they may be lactiferous.
5. n. In bryology, the narrow continuous cells which surround the utricles in the leaves of Sphagnum.
6. To draw: said of muscles which abduct, adduct, or circumduct a part, such as the leg or the eye.

Wiktionary

1. n. a pipe, tube or canal which carries air or liquid from one place to another, as in heating and air-conditioning ducts.
2. v. To channel something through a duct (or series of ducts)

GNU Webster's 1913

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

WordNet 3.0

1. n. a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance
2. n. an enclosed conduit for a fluid
3. n. a continuous tube formed by a row of elongated cells lacking intervening end walls