coolant

American  

[koo-luhnt] / ˈku lənt /

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 British  

/ 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

---

Etymology

Origin of coolant

First recorded in 1925–30; cool + -ant

Example Sentences

While most people might be familiar with helium as a filler for balloons, the gas is used as a coolant, including in semiconductor manufacturing and MRI machines.

From Salon

Most Americans think of helium as the gas that holds balloons aloft, but, more important, it is an essential coolant in MRI machines and semiconductor manufacturing.

From The Wall Street Journal

It’s true that some exotic fluids like battery coolant need to be monitored on an EV, and if you have a lead foot, you might burn through tires faster.

From The Wall Street Journal

A student from Hurlford, she then went down a rabbit hole looking at the amount of water that would be needed for coolant, the process which stops the computer chips there from overheating.

From BBC

Its Arctic climate acts as a natural coolant for heat-intensive hardware.

From The Wall Street Journal