Hypertext Webster Gateway: "aqueduct"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Aqueduct \Aq"ue*duct\, n. [F. aqueduc, OF. aqueduct (Cotgr.),
fr. L. aquaeductus; aquae, gen. of aqua water + ductus a
leading, ducere to lead. See {Aqua}, {Duke}.]
1. A conductor, conduit, or artificial channel for conveying
water, especially one for supplying large cities with
water.
Note: The term is also applied to a structure (similar to the
ancient aqueducts), for conveying a canal over a river
or hollow; more properly called an aqueduct bridge.
2. (Anat.) A canal or passage; as, the aqueduct of Sylvius, a
channel connecting the third and fourth ventricles of the
brain.
From WordNet (r) 1.7 (wn)
aqueduct
n : a conduit that resembles a bridge but carries water over a
valley
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