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Adjective: exothermic  `ek-sow'thur-mik
  1. (of a chemical reaction or compound) occurring or formed with the liberation of heat
    "Reactions that produce heat as they take place are called exothermic"
    - exothermal, heat-releasing

See also: energy-releasing, exoergic, exotherm

Antonym: endothermic

Encyclopedia: Exothermic