English

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Etymology

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From French exothermique, from exo- (outside) + thermique (of heat), both ultimately from Ancient Greek.

Adjective

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exothermic (comparative more exothermic, superlative most exothermic)

  1. (chemistry, of a reaction) That releases energy in the form of heat.
  2. (chemistry, of a compound) That releases heat during its formation, and absorbs it during its decomposition.
  3. (zoology) Of an animal: whose body temperature is regulated by external factors; cold-blooded.

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Antonyms

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