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heat reservoir

noun, Thermodynamics
a hypothetical body of infinitely large mass capable of absorbing or rejecting unlimited quantities of heat without undergoing appreciable changes in temperature, pressure, or density. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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  • He had to pump that heat into a heat-reservoir—a water tank probably—to protect himself.

    The Ultimate Weapon John Wood Campbell

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