Hypertext Webster Gateway: "penstock"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Penstock \Pen"stock\, n. [Etymol. uncertain; perh. fr. pen an
inclosure + stock.]
1. A close conduit or pipe for conducting water, as, to a
water wheel, or for emptying a pond, or for domestic uses.
2. The barrel of a wooden pump.
From WordNet (r) 1.7 (wn)
penstock
n 1: regulator consisting of a valve or gate that controls the
rate of water flow through a sluice [syn: {sluicegate},
{sluice valve}, {floodgate}, {head gate}, {water gate}]
2: conduit that carries a rapid flow of water controlled by a
sluicegate [syn: {sluice}, {sluiceway}]
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