hydrostat

/ˈhaɪdrəˌstæt/
noun
  1. A device that automatically controls the level or flow of water, such as in a boiler or irrigation system.
    • The hydrostat in the basement keeps the water pressure steady.
    • The plumber installed a new hydrostat to prevent the tank from overflowing.
    • Farmers use a hydrostat to regulate irrigation in the fields.
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