coolant

Noun
  1. A fluid agent (gas or liquid) that produces cooling;
    Especially one used to cool a system by transferring heat away from one part to another (synset 114846311)
    "he added more coolant to the car's radiator"; "the atomic reactor used a gas coolant"; "lathe operators use an emulsion of oil and water as a coolant for the cutting tool"
    is a type of:
    • agent - a substance that exerts some force or effect
    • fluid - a substance that is fluid at room temperature and pressure

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