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.
If the water discharged to a wastewater treatment plant contained any chemical, like a coolant, that information would have to be disclosed to the wastewater treatment plant so it can be treated. Caitlin Looby, jsonline.com, 27 Mar. 2026 Ice used as an exterior coolant is prohibited from being used as bagged ice. Paige Moore, AZCentral.com, 19 Mar. 2026 When the engine is cold, the first step is to check the coolant level in both the radiator and the expansion tank. John Paul, The Providence Journal, 13 Mar. 2026 Water is replaced with liquid sodium coolant, which melts at around 1,616 °F (880 °C) and is transparent to neutrons. David Szondy march 08, New Atlas, 8 Mar. 2026 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 4 Apr. 2026.

Kids Definition

coolant

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

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