Definition of coolant noun from the Oxford Advanced Learner's Dictionary

 

coolant

 noun
noun
BrE BrE//ˈkuːlənt//
 
; NAmE NAmE//ˈkuːlənt//
 
[countable, uncountable]
 
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a liquid that is used for cooling an engine, a nuclear reactor, etc. Word Origin 1930s: from cool, on the pattern of lubricant.
See the Oxford Advanced American Dictionary entry: coolant