pen|stock

pen|stock
pen|stock «PEHN STOK», noun.
1. a) a channel for carrying water to a water wheel. b) a pipe for carrying water to a turbine: »

Water to drive the turbines drops sixteen times the height of Niagara Falls, through a penstock bored into the mountain and connecting with a huge ten-mile-long tunnel from Tahtsa Lake to the east (New York Times).

2. a sluice or floodgate for restraining or regulating the flow from a head of water formed by a weir, dam, or other obstruction: »

Apart from the associated damage to penstocks and valves, the large-scale flooding might cause great damage to industrial facilities downstream (The Effects of Atomic Weapons).

[< pen2 + stock, in the obsolete sense “trough”]

Useful english dictionary. 2012.

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