1. (n.) A conduit or channel for supplying cities with water\; a conductor for conveying water

2. (n.) A canal or passage; as, the aqueduct of Sylvius, a channel connecting the third and fourth ventricles of the brain.

arroyo bed canal canalization channel conduit course creek bed crimp culvert cut dike ditch donga dry bed duct entrenchment flume fosse goffer gulch gully gullyhole gutter ha-ha headrace irrigation ditch kennel moat nullah pleat race river bed riverway runnel sluice spillbox spillway stream bed streamway sunk fence swash swash channel tailrace trench trough wadi water carrier water channel water furrow water gap water gate watercourse waterway waterworks