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.]
A conductor, conduit, or artificial channel for conveying water, especially one for supplying large cities with water.
⇒ 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.
A canal or passage; as, the aqueduct of Sylvius, a channel connecting the third and fourth ventricles of the brain.
© Webster 1913.