riffle

Concise Oxford English Dictionary © 2008 Oxford University Press:
riffle/ˈrɪfl/

▶verb

• 1 turn over something, especially pages, quickly and casually.

  ■ (riffle through) search quickly through.

  ■ disturb the surface of; ruffle.

• 2 shuffle (playing cards) by flicking up and releasing the corners of two piles of cards so that they intermingle.

▶noun

• 1 an act of riffling.

• 2 N. Amer. a shallow part of a stream or river.

  ■ a patch of waves or ripples.

– origin C18: perh. from a var. of ruffle, influenced by ripple.