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Definition of coolant

coolant

/ˈkuː.lənt/
cool · ant
Plural:coolants
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coolant Lexical Profile

coolant Game Scores & Validity

• noun

1

A fluid or gas used to cool a system or transfer heat away from an engine, nuclear reactor, or industrial machine.

Example

"The mechanic topped off the radiator with fresh coolant before we set out on our summer road trip."

Synonyms
View all synonyms for coolant

• Nearby Words

cooktop
cookware
cool
coolant
coolbox
cooldown
cooler

Word Origin & Etymology

Coined in the 1920s from the verb 'cool' combined with the agent suffix '-ant' (borrowed from Latin -antem), modeled on earlier technical nouns such as 'lubricant' and 'refrigerant'.

Cite this Entry

Wordmom. (2026). Definition of Coolant. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/coolant
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