WordWeb Online

1. A fluid agent (gas or liquid) that produces cooling; especially one used to cool a system by transferring heat away from one part to another
   "he added more coolant to the car's radiator"; "the atomic reactor used a gas coolant"; "lathe operators use an emulsion of oil and water as a coolant for the cutting tool"

Derived forms: coolants

See also: cool

Type of: agent, fluid

Encyclopedia: Coolant