spillway

• POS: Noun
• HYPHEN: spill=way

CIDE DICTIONARY

spillway, n. 

 A sluiceway or passage for superfluous water in a reservoir, to prevent too great pressure on the dam.  [1913 Webster]

OXFORD DICTIONARY

spillway, n. a passage for surplus water from a dam.

THESAURUS

spillway

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