Definition of "penstock" []

• A sluice or gate used to control a flow of water. (noun)
• A pipe or conduit used to carry water to a water wheel or turbine. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The distance to the nearest penstock is 6,180 feet, in which length the fall in grade is 28 feet."
• "They were working as contractors for Xcel inside a large, drained water pipe called a penstock when a fire erupted."
• "Aloft in a section of steel water-tunnel liner called a penstock, government officials view the Hoover Dam construction site."