penstock noun. ['pɛnstɒk] E17.
[from PEN noun¹ + STOCK noun¹.]
1. A sluice or floodgate regulating the flow from a pent body of water, as in a water-mill. E17.

2. A channel, trough, or tube for conveying water from a lake, dam, etc., esp. to a water-wheel or turbine. Orig. US. L18.

[TahlilGaran] English Dictionary ▲