coolant

Plural: coolants

Noun

• 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
  • "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"
• A medium, usually fluid, used to draw heat from an object.

Examples

• "Coolant is used in car engines and industrial processes, where excess heat could cause machine damage."