coolant

noun

cool·​ant ˈkü-lənt 

: a usually fluid cooling agent

Examples of coolant in a Sentence

Recent Examples on the Web

Argo Space’s satellites will use water not only as a propellant, but also as a coolant and radiation shield. — Stephen Clark, ArsTechnica, 6 Nov. 2026

Their surfaces could carry machining oil, coolant residue, dirt and loose metal shavings. — Rajesh Iyengar, Forbes.com, 5 Nov. 2026

Their solution replaces traditional solid conductors with hollow ones, allowing coolant to flow through the wire itself. — Christopher McFadden, Interesting Engineering, 30 Oct. 2026

Meanwhile, Paladin accidentally tracks down the Butcherbird Killer, a female synthezoid who’s leaking coolant just like Vision. — Tasha Robinson, Vulture, 21 Oct. 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