coolant

noun

cool·​ant ˈkü-lənt 

: a usually fluid cooling agent

Examples of coolant in a Sentence

Recent Examples on the Web

The experts cranked the reactor coolant system to maximum operational temperatures and pressures without using nuclear fuel. — Mrigakshi Dixit, Interesting Engineering, 18 Aug. 2026

Mixing different coolant chemistries can reduce corrosion protection and shorten coolant life. — John Paul Senior Manager Public Affairs and Traffic Safety Aaa Northeast, Hartford Courant, 15 Aug. 2026

The Danube has fallen to record lows after successive European heatwaves, wreaking havoc on both Romanian and Hungarian reactors that rely on the river for coolant. — semafor.com, 5 Aug. 2026

When the performance finished, those technicians rushed to spray their now sizzling lidar with coolant following that four-minute exertion. — Charlie Campbell, Time, 23 July 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