penstock /penˈstok/

1. A sluice
2. (in a hydroelectric or other plant) a valve-controlled water conduit

• upwellings
• upwells
• upwent
• upwhirl
• upwhirled
• upwhirling
• upwhirls
• up-wind
• upwind
• upwinding
• upwinds
• up with
• upwound
• upwrap
• upwraps
• upwrought
• up yours
• ur
• ur-
• urachi
• urachus
• urachuses
• uracil
• uracils
• uraei