Dictionary  pen•stockPronunciation: (pen'stok"), [key] —n. 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 dam 1. 3. a sluicelike contrivance used to control the flow of water. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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