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Dictionary

cool•ant

Pronunciation: (kOO'lunt), [key]
—n.
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.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

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