Penstock
Pronunciation : Pen"stock
Part of Speech : n.
Etymology : [Etymol. uncertain; perh. fr. pen an inclosure + stock.]
Definition : 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.
Source : Webster's Unabridged Dictionary, 1913