penstock /penˈstok/

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

• slide valve
• slide valves
• sliding
• sliding keel
• sliding keels
• slidingly
• sliding-rule
• slidings
• sliding scale
• sliding scales
• sliding seat
• sliding seats
• slier
• sliest
• 'slife
• 'slight
• slight
• slighted
• slighter
• slightest
• slighting
• slightingly
• slightish
• slightly
• slightness