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

Opened in 1971, it was the second Magnox power station in Wales after Trawsfynydd came online six years earlier, with seawater an ideal coolant due to its location on Anglesey's northern coast.

From BBC

Drivers are advised to check tyres, expect delays, ensure oil and coolant levels are correct.

From BBC

Traditional cooling systems often rely on compressing a chemical coolant, which can be toxic.

From BBC

The reactor vessel, which holds the fuel, control rods, and coolant, lies at the center of a nuclear reactor building.

From Literature

Oklo is developing small modular nuclear reactors that use a non-water coolant—liquid metal sodium—and an enriched type of uranium fuel that is in limited supply.

From The Wall Street Journal