'Exothermic' definitions:

Definition of 'exothermic'

From: WordNet
adjective
(of a chemical reaction or compound) occurring or formed with the liberation of heat [syn: exothermic, exothermal, heat-releasing] [ant: endothermal, endothermic, heat-absorbing]

Definition of 'Exothermic'

From: GCIDE
  • Exothermic \Ex`o*ther"mic\, a. [Pref. exo- + thermic.] (Chem.) Characterized by, or formed with, evolution of heat; as, an exothermic reaction; -- opposed to endothermic. [Webster 1913 Suppl.]