Riffle

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Riffle

(n.) A trough or sluice having cleats, grooves, or steps across the bottom for holding quicksilver and catching particles of gold when auriferous earth is washed; also, one of the cleats, grooves, or steps in such a trough. Also called ripple.
(n.) A ripple in a stream or current of water; also, a place where the water ripples, as on a shallow rapid.