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Aqueduct

n.
  1. A conductor, conduit, or artificial channel for conveying water, especially one for supplying large cities with water.
  2. (Anat.) A canal or passage; as, the aqueduct of Sylvius, a channel connecting the third and fourth ventricles of the brain.

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.