Riffle
Part of speech: noun
Definition: A fast-flowing, shallow part of a stream 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 trough. A quick skim through the pages of a book
Part of speech: verb
Definition: To ruffle with a rippling action To skim or flick through the pages of a book To prepare samples of material using a riffler
Rippling
Part of speech: verb
Definition: To move like the undulating surface of a body of water; to undulate.