Real Dictionary

coolant
variable noun: Coolant is a liquid used to keep a machine or engine cool while it is operating.

coolant in American English
a substance, usually a fluid, used to remove heat, as from a nuclear reactor, an internal-combustion engine, molten metal, etc.
noun: 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 fr

coolant in Automotive Engineering
noun: Coolant is a liquid used to keep an engine, compressor, or other machine cool while it is operating.

coolant in British English
noun: a fluid used to cool a system or to transfer heat from one part of it to another

coolant in Mechanical Engineering
noun: Coolant is a fluid used to cool a system or to transfer heat from one part of it to another.