1. A trough for supplying water to a mill, &c., furnished with a floodgate. See Pen.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• oenstock,
• lenstock,
• -enstock,
• 0enstock,
• pwnstock,
• psnstock,
• pdnstock,
• prnstock,
• p4nstock,
• p3nstock,
• pebstock,
• pemstock,
• pejstock,
• penestock,
• penstok,
• penstcok,
• penstokc,
• pennstock,
• penstoock,
• penstockk

• penny stock,
• penstemon,
• Penniston,
• pennisetum.

The plural of the "penstock" can be the "penstocks".

The singular of the "penstock" can be the "penstock".