b'Simon van der Sluijs * artistD R A W I N G PA I N T I N G S C U L P T U R E P U P P E T R Y M A S K S*sluice |slos|(also sluice gate) a sliding gate or other device for controlling the flow of water, esp. one in a lock gate.ORIGIN Middle English (as a noun): from Old French escluse sluice gate, based on Latin excludere exclude.The verb dates from the late 16th cent.1'