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.
- ethnicity
- ethnic profiling
- ethno-
- ethnoastronomical
- ethnoastronomy
- ethnobiological
- ethnobiologist
- ethnobiology
- ethnobotanical
- ethnobotanically
- ethnobotanist
- ethnobotany
- ethnocentric
- ethnocentrically
- ethnocentricity
- ethnocentrism
- ethnogenesis
- ethnographer
- ethnographic
- ethnographical
- ethnographically
- ethnography
- ethnohistorian
- ethnohistoric
- ethnohistorical