1.
[syn: exothermic, exothermal, heat-releasing]
The Collaborative International Dictionary of English v.0.48:
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.]
WordNet (r) 3.0 (2006):
exothermic
adj 1: (of a chemical reaction or compound) occurring or formed
with the liberation of heat [syn: exothermic,
exothermal, heat-releasing] [ant: endothermal,
endothermic, heat-absorbing]