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From The Collaborative International Dictionary of English v.0.48:
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]