| Spillway (n.) A sluiceway or passage for superfluous water in a reservoir, to prevent too great pressure on the dam. Thesaurus Entries aqueduct, arroyo, bed, canal, creek bed, culvert, donga, dry bed, flume, gulch, gully, gullyhole, headrace, irrigation ditch, nullah, race, river bed, riverway, runnel, sluice, spillbox, stream bed, streamway, swash, swash channel, tailrace, wadi, water carrier, water channel, water furrow, water gap, water gate, watercourse, waterway, waterworks |