pen·stock

[pen-stok]
noun
1.
a pipe conducting water from a head gate to a waterwheel.
2.
a conduit for conveying water to a power plant. See diag. under dam1.
3.
a sluicelike contrivance used to control the flow of water.

Origin:
1600–10; pen2 + stock

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
penstock (ˈpɛnˌstɒk) [Click for IPA pronunciation guide]
 
n
1.  a conduit that supplies water to a hydroelectric power plant
2.  a channel bringing water from the head gates to a water wheel
3.  a sluice for controlling water flow
 
[C17: from pen² + stock]

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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00:10
Penstock is always a great word to know.
So is zedonk. Does it mean:
a stew of meat, vegetables, potatoes, etc.
the offspring of a zebra and a donkey.
American Heritage
Science Dictionary
penstock   (pěn'stŏk')  Pronunciation Key 
  1. A sluice or gate used to control a flow of water.

  2. A pipe or conduit used to carry water to a water wheel or turbine.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Water from the reservoir rushes through the penstock into the powerhouse.
Inspections of de-watered external structures and of the penstock confirmed the
  presence of quagga mussels.
To generate hydroelectricity, water from a river or reservoir is directed into
  a large pipe called a penstock.
When power is needed, water is released from the reservoir through a large pipe
  called a penstock and into a turbine.
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