coolant

noun

cool·​ant ˈkü-lənt 

: a usually fluid cooling agent

Examples of coolant in a Sentence

Recent Examples on the Web

These microscopic ceramic coatings act as individual containment structures that withstand extreme temperatures without melting, eliminating the need for complex, active emergency coolant pumps. — Aman Tripathi, Interesting Engineering, 4 Sep. 2026

Marquez says to check the level of coolant, which keeps the car from getting too hot in the summer, only when the engine is cold. — Lois K. Solomon, Sun Sentinel, 22 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

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