From The Collaborative International Dictionary of English v.0.48 [gcide]:
From WordNet (r) 3.0 (2006) [wn]:
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; "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"
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