coolant

noun

cool·​ant ˈkü-lənt How to pronounce coolant (audio)
: a usually fluid cooling agent

Examples of coolant in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Ambient temps hovered around 90 degrees during my afternoon behind the wheel, and besides some brake and tire fade after nearly an hour of play, the GT’s oil and coolant temperatures remained pegged in the middle the whole time. Peter Nelson, Forbes.com, 7 July 2025 Heavy water is used as a coolant for certain types of reactors, with plutonium — which can be used to make an atomic bomb — produced as a byproduct. Elena Becatoros, Chicago Tribune, 20 June 2025 Always check your vehicle's coolant levels and windshield wiper fluid. Mariyam Muhammad, The Enquirer, 10 July 2025 In 2010, the U.S. Environmental Protection Agency (EPA) banned the sale of new AC units (either central AC or window models) that use Freon—also known as R-22—as a coolant. Jeffrey Kluger, Time, 25 June 2025 See All Example Sentences for coolant

Word History

First Known Use

1915, in the meaning defined above

Time Traveler
The first known use of coolant was in 1915

Browse Nearby Words

Cite this Entry

“Coolant.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/coolant. Accessed 27 Jul. 2025.

Kids Definition

coolant

noun
cool·​ant ˈkü-lənt How to pronounce coolant (audio)
: a usually fluid cooling substance

More from Merriam-Webster on coolant

Last Updated: - Updated example sentences
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