| 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 |
| Penstock (n.) A close conduit or pipe for conducting water, as, to a water wheel, or for emptying a pond, or for domestic uses. |
| Penstock (n.) The barrel of a wooden pump. |