Riffle
Pronunciation : Rif"fle
Part of Speech : n.
Etymology : [CF. G. riffeln, riefeln, to groove. Cf. Rifle a gun.] (Mining)
Definition : Defn: 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.
Source : Webster's Unabridged Dictionary, 1913