coolant

noun

cool·​ant ˈkü-lənt 

: a usually fluid cooling agent

Examples of coolant in a Sentence

Recent Examples on the Web

Higher river temperatures are also affecting France’s nuclear plants, which require water as a coolant. — Tim Lister, CNN Money, 11 July 2026

Geely’s battery uses a dual-sided 3D liquid cooling system that surrounds the cell groups with coolant. — Sujita Sinha, Interesting Engineering, 8 July 2026

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

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

Word History

Etymology

cool entry 2 + -ant entry 1

First Known Use

1915, in the meaning defined above

Rhymes for coolant

• puberulent
• pulverulent

Kids Definition

coolant

noun

cool·​ant ˈkü-lənt 

: a usually fluid cooling substance