[pen-stok] /ˈpɛnˌstɒk/
a pipe conducting water from a head gate to a waterwheel.
a conduit for conveying water to a power plant.
See diag. under dam1 .
a sluicelike contrivance used to control the flow of water.
1600–10; pen2 + stock
Example Sentences for penstock
Gravity causes it to fall through the penstock inside the dam.
To generate hydroelectricity, water from a river or reservoir is directed into a large pipe called a penstock.
Check condition of interior coating and exterior coating of exposed portions of penstock.
The water pressure is funneled through a tunnel through the dam called a penstock.
Inspections of de-watered external structures and of the penstock confirmed the presence of quagga mussels.
The penstock has been drained and filled with concrete to remove the source of water believed to be the cause of the problem.
When power is needed, water is released from the reservoir through a large pipe called a penstock and into a turbine.
Water from the reservoir rushes through the penstock into the powerhouse.
British Dictionary definitions for penstock
penstock (ˈpɛnˌstɒk)
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
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penstock in Science
  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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