flume

[floom]
noun
1.
a deep narrow defile containing a mountain stream or torrent.
2.
an artificial channel or trough for conducting water, as one used to transport logs or provide water power.
3.
an amusement park ride in which passengers are carried in a boatlike or loglike conveyance through a narrow, water-filled chute or over a water slide.
verb (used with object), flumed, fluming.
4.
to transport in a flume.
5.
to divert (a stream) by a flume.

Origin:
1125–75; Middle English flum < Old FrenchLatin flūmen stream

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
flume (fluːm)
 
n
1.  a ravine through which a stream flows
2.  a narrow artificial channel made for providing water for power, floating logs, etc
3.  a slide in the form of a long and winding tube with a stream of water running through it that descends into a purpose-built pool
 
vb
4.  (tr) to transport (logs) in a flume
 
[C12: from Old French flum, ultimately from Latin flūmen stream, from fluere to flow]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

flume
c.1175, "stream," from O.Fr. flum, from L. flumen "river," from fluere "to flow" (see fluent). In U.S., used especially of artificial streams channeled for some industrial purpose.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They ride the flume of the circulatory system to the liver.
The pylon disappears inside a towering flume of powder.
It also has picnic area, lagoon for swimming, white sandy beach area and flume
  water slides.
The more daring members can check out the park's flume slides, while the lazy
  river and wave pool offer more relaxing atmospheres.
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