riffle

[rif-uhl]
verb (used with object), verb (used without object), riffled, riffling.
1.
to turn hastily; flutter and shift: to riffle a stack of letters; to riffle through a book.
2.
Cards. to shuffle by dividing the deck in two, raising the corners slightly, and allowing them to fall alternately together.
3.
to cause or become a riffle.
noun
4.
a rapid, as in a stream.
5.
a ripple, as upon the surface of water.
6.
Mining. the lining of transverse bars or slats on the bed of a sluice, arranged so as to catch heavy minerals, as gold or platinum.
7.
a hopper for distributing bulk material.
8.
the act or method of riffling cards.

Origin:
1630–40; blend of ripple1 and ruffle1

unriffled, adjective

riffle, rifle.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
riffle (ˈrɪfəl)
 
vb (when intr, often foll by through)
1.  to flick rapidly through (the pages of a book, magazine, etc), esp in a desultory manner
2.  to shuffle (playing cards) by halving the pack and flicking the adjacent corners together
3.  to make or become a riffle
 
n
4.  (US), (Canadian)
 a.  a rapid in a stream
 b.  a rocky shoal causing a rapid
 c.  a ripple on water
5.  mining a contrivance on the bottom of a sluice, containing transverse grooves for trapping particles of gold
6.  the act or an instance of riffling
 
[C18: probably from ruffle1, influenced by ripple1]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

riffle
1754, "to make choppy water," Amer.Eng., perhaps a variant of ruffle "make rough." The word meaning "shuffle" (cards) is first recorded 1894, probably echoic; that of "skim, leaf through quickly" is from 1922.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Pool-and riffle-level composition of habitats in the study segments.
Riffle areas usually form between two bends at the point where the thalweg
  crosses over from one side of the channel to the other.
Pool riffle complexes are designed to direct the flow towards the center of the
  channel.
During the spring, riffle areas are popular fishing sites.
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