penstock

Etymology

Perhaps from pen (“an enclosure”) + stock.

noun

  1. A sluice or pipe which allows the controlled flow of water from behind a dam, typically routing it to a turbine of a power plant.
    It amazes him still, this effortless journey powered by the fall of water. Water surging through tunnel and penstock. 2017, Fiona Farrell, Decline and Fall on Savage Street, page 30
  2. The barrel of a wooden pump.

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