01 n. A trough or sluice having cleats, grooves, or steps across the bottom for holding quicksilver and catching particles of gold when auriferou…
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1.
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.(Mining)
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2.
A ripple in a stream or current of water; also, a place where the water ripples, as on a shallow rapid.[Local, U. S.]“The bass have left the cool depth beside the rock and are on the riffle or just below it.” — James A. Henshall.