coolant

[ koo-luhnt ]

noun

1. a substance, usually a liquid or a gas, used to reduce the temperature of a system below a specified value by conducting away the heat produced in the operation of the system, as the liquid in an automobile cooling system or the fluid that removes heat from the core of a nuclear reactor.
2. a lubricant that dissipates the heat caused by friction.

coolant

/ ˈkuːlənt /

noun

1. a fluid used to cool a system or to transfer heat from one part of it to another
2. a liquid, such as an emulsion of oil, water, and soft soap, used to lubricate and cool the workpiece and cutting tool during machining

Word History and Origins

Origin of coolant¹

First recorded in 1925–30; cool + -ant

Example Sentences

Serhiy, the only man on the team, has to pour in bottled water by hand as a coolant.

From BBC

Rather than try to keep these rooms cool with traditional air-conditioning units, many companies use water as a coolant, running it past the servers to chill them out.

From Salon

The RAC urged drivers to check the coolant and oil levels in their vehicles as high temperatures increase the risk of vehicle breakdowns and cars overheating.

From BBC

Maintenance costs up to $3,000 a year, compared with $600 prepandemic, partly because of higher coolant costs.

From New York Times

That incident followed coolant leaks from Russian spacecraft parked at the station.

From Seattle Times