RIFFLE

Rif″fle (?), n. [[CF. G. riffeln, riefeln, to groove. Cf. Rifle a gun.]] (Mining) 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.