From The Collaborative International Dictionary of English v.0.48 [gcide]:
Duct \Duct\ (d[u^]kt), n. [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.
[1913 Webster]
2. (Anat.) One of the vessels of an animal body by which the
products of glandular secretion are conveyed to their
destination.
[1913 Webster]
3. (Bot.) A large, elongated cell, either round or prismatic,
usually found associated with woody fiber.
[1913 Webster]
Note: Ducts are classified, according to the character of the
surface of their walls, or their structure, as annular,
spiral, scalariform, etc.
[1913 Webster]
4. Guidance; direction. [Obs.] --Hammond.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
duct
n 1: 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" [syn:
{duct}, {epithelial duct}, {canal}, {channel}]
2: a continuous tube formed by a row of elongated cells lacking
intervening end walls
3: an enclosed conduit for a fluid
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