pen·stock 
(pĕnstŏk′)
(pĕnstŏk′)n.
1. A sluice or gate used to control a flow of water.
2. A pipe or conduit used to carry water to a water wheel or turbine.
- blood clot
- blood clotting
- blood count
- bloodcurdling
- bloodcurdlingly
- blood diamond
- blood doping
- blooded
- blood feud
- blood fluke
- blood gas
- blood glucose
- blood group
- blood grouping
- bloodguilt
- blood heat
- bloodhound
- bloodily
- bloodiness
- blood knot
- bloodless
- bloodlessly
- bloodlessness
- bloodletter
- bloodletting