Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A pipe, tube or canal which carries air or liquid from one place to another.
  • n. An enclosure or channel for electrical cable runs.
  • n. Guidance; direction.
  • v. To channel something through a duct (or series of ducts)

from the GNU version of the Collaborative International Dictionary of English

  • 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. A large, elongated cell, either round or prismatic, usually found associated with woody fiber.
  • n. Guidance; direction.

from The Century Dictionary and Cyclopedia

  • To draw: said of muscles which abduct, adduct, or circumduct a part, such as the leg or the eye.
  • n. Leading; guidance; direction; bearing.
  • n. Any tube or canal by which a fluid is conducted or conveyed.
  • n. In bot.:
  • 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.
  • n. In bryology, the narrow continuous cells which surround the utricles in the leaves of Sphagnum.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

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

Etymologies

Latin ductus, act of leading, from past participle of dūcere, to lead; see deuk- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin ductus, noun use of past participle of dūcere ("to lead, draw"). Compare douit. (Wiktionary)

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