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3 definitions found
 for penstock
From The Collaborative International Dictionary of English v.0.48 :

  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.
        [1913 Webster]
     2. The barrel of a wooden pump.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

      n 1: regulator consisting of a valve or gate that controls the
           rate of water flow through a sluice [syn: sluicegate,
           sluice valve, floodgate, penstock, head gate,
           water gate]
      2: conduit that carries a rapid flow of water controlled by a
         sluicegate [syn: sluice, sluiceway, penstock]

From Moby Thesaurus II by Grady Ward, 1.0 :

  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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