sluice
Concise Oxford English Dictionary © 2008 Oxford University Press:
sluice /sluːs/
▶noun
- 1 (also sluice gate) a sliding gate or other device for controlling the flow of water, especially in a lock gate.
- 2 (also sluiceway) an artificial water channel for carrying off overflow or surplus water.
- 3 an act of rinsing or showering with water.
– origin ME: from OFr. escluse ‘sluice gate’, based on L. excludere ‘exclude’.
'sluice' also found in these Oxford entries:

