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The Collaborative International Dictionary of English v.0.48 (gcide)

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.
[1913 Webster]

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.
[1913 Webster]

2. (Anat.) A canal or passage; as, the aqueduct of Sylvius, a
channel connecting the third and fourth ventricles of the
brain.
[1913 Webster]