From The Collaborative International Dictionary of English v.0.44 [gcide]:
Penstock \Pen"stock\, noun [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) 2.0 [wn]:
noun
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}]
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
21 Moby Thesaurus words for "penstock": aboideau, air lock, chute, dock gate, eaves trough, flood-hatch, floodgate, gate, guide, gutter, head gate, lock, lock gate, pentrough, shoot, sluice, sluice gate, tide gate, trough, water gate, weir
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