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.
The test ended when a leak formed in the inner wall, allowing coolant to enter the combustion area and extinguish the flame. Kaif Shaikh, Interesting Engineering, 25 May 2026 Replacing water as the nuclear reactor’s coolant is much more problematic. Robin George Andrews, Scientific American, 19 May 2026 Those small issues that started earlier—a weak battery or marginal coolant levels—often finally fail during long, hot drives. Christopher Elliott, Forbes.com, 16 May 2026 These pump coolant through pipes to dissipate heat from servers rather than evaporating water as has been the case in the past. Jonathan M. Gitlin, ArsTechnica, 28 Apr. 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

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Cite this Entry

“Coolant.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/coolant. Accessed 28 May. 2026.

Kids Definition

coolant

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

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