coolant

noun

cool·​ant ˈkü-lənt 

: a usually fluid cooling agent

Examples of coolant in a Sentence

Recent Examples on the Web

Just as a car rarely requires additional coolant, closed-loop server cooling consumes no ongoing water. — Kevin Brown, Forbes.com, 24 Sep. 2026

Detecting small temperature changes could give operators an early warning that coolant is beginning to solidify. — Georgina Jedikovska, Interesting Engineering, 22 Sep. 2026

Other liquids like engine coolant absorb extreme heat and also prevent corrosion or freezing in cold weather. — Charles Singh, USA Today, 17 Sep. 2026

Change the oil on schedule, check transmission, coolant, brake and power steering fluids regularly, and follow the manufacturer’s service schedule. — Lauren Jarvis-Gibson, Miami Herald, 11 Sep. 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