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OXFORD DICTIONARY

exothermic

Adjective

ex=o=ther=mic

WORDNET DICTIONARY

exothermic(a = adj.all) exothermal, heat-releasing - (of a chemical reaction or compound) occurring or formed with the liberation of heat; Array

Antonym: endothermic

Derived form noun exotherm₁

exothermic, a. [Pref. exo- + thermic.].

Characterized by, or formed with, evolution of heat; as, an exothermic reaction; -- opposed to endothermic. [Webster 1913 Suppl.]

exothermic, adj. (also exothermal) esp. Chem. occurring or formed with the evolution of heat.

Derivative

exothermally adv. exothermically adv.

For further exploring for "exothermic" in Webster Dictionary Online