Coolant — definition

1. coolant (Noun)

coolant (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. ex. "he added more coolant to the car's radiator" ex. "the atomic reactor used a gas coolant" ex. "lathe operators use an emulsion of oil and water as a coolant for the cutting tool"

agent fluid