Etymology
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coolant (n.)

"radiator fluid," 1915, from cool (adj.) + -ant.

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Definitions of coolant

coolant (n.)
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
From wordnet.princeton.edu