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[koo-luh nt] /ˈku lənt/
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.
a lubricant that dissipates the heat caused by friction.
Origin of coolant
1925-30; cool + -ant Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for coolant
  • Its sodium coolant has a high boiling point-today's reactors use water-and would absorb excess heat.
  • The outsides of the pipes are cooled by some of the coolant circulated by the engine.
  • The only long-term answer is not to add coolant or to drive more slowly, but to fix up the car.
  • The large surface area of the coiled tube coupled with the constant flow of fresh coolant makes for efficient condensing.
  • In those cases, the hydrogen was manufactured and stored for use as a generator coolant in coal fired power stations.
  • GM also is adding a sensor to monitor coolant levels and will attach a bracket to keep the coolant tank from leaking.
  • Only a small amount of coolant, a few cupfuls, were involved.
  • Keep a spare in the trunk, along with jumper cables, oil and extra coolant or antifreeze.
  • Learn how to change a tire, have your spare in order and keep extra oil and coolant in the trunk.
  • Stay close to water to replenish the coolant, which boiled off and threatened to let the engine overheat.
British Dictionary definitions for coolant


a fluid used to cool a system or to transfer heat from one part of it to another
a liquid, such as an emulsion of oil, water, and soft soap, used to lubricate and cool the workpiece and cutting tool during machining
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for coolant

"radiator fluid," 1930, from cool (adj.) + -ant.

Online Etymology Dictionary, © 2010 Douglas Harper
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