coolant

noun

cool·​ant ˈkü-lənt 

: a usually fluid cooling agent

Examples of coolant in a Sentence

Recent Examples on the Web

Instead, the system uses inert helium gas as its main coolant. — Aman Tripathi, Interesting Engineering, 29 July 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

Commercial refrigerators and air conditioners were going to transition to new, less damaging coolants, which are available. — Blanca Begert, Los Angeles Times, 21 July 2026

Keeping coolant levels topped off, checking belts and hoses, and ensuring your engine isn’t overheating all contribute to overall performance, including the air conditioning system. — Jessica Safavimehr, Southern Living, 20 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