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Exothermic (adjective)
That releases energy in the form of heat.
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Exothermic (adjective)
That releases heat during its formation, and absorbs it during its decomposition
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Exothermic (adjective)
Of an animal: whose body temperature is regulated by external factors; cold-blooded.
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Endothermic (adjective)
Of a chemical reaction that absorbs heat energy from its surroundings.
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Endothermic (adjective)
Of an animal whose body temperature is regulated by internal factors.
Wiktionary