GNU Collaborative International Dictionary of English

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1.       
   Riffle , 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.
   1913 Webster
   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.
   
   Webster 1913 Suppl.