Etymology
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exothermic (adj.)

1874, in chemistry, "relating to a liberation of heat," modeled on French exothermique (1869, Berthelot); see exo- + thermal.

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Definitions of exothermic

exothermic (adj.)
(of a chemical reaction or compound) occurring or formed with the liberation of heat;
Synonyms: exothermal / heat-releasing
From wordnet.princeton.edu