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
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Check coolant and brake fluid a few times per year, and monitor tire pressure monthly, especially with seasonal temperature changes. John Paul Senior Manager Public Affairs and Traffic Safety Aaa Northeast, Hartford Courant, 27 June 2026 The system relies on a liquid coolant made up of 75 percent water and 25 percent propylene glycol, which circulates through cold plates attached to processors. Georgina Jedikovska, Interesting Engineering, 24 June 2026 In addition, the coolant can remain operational at temperatures of up to 45 °C or 113 °F, a much higher temperature than previous systems. Jacqueline Munis, Fortune, 22 June 2026 Maintaining proper coolant levels is one way to keep your car's mechanical components in good shape. Charles Singh, USA Today, 22 June 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 5 Jul. 2026.

Kids Definition

coolant

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

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