Definition of exothermic adjective from the Oxford Advanced Learner's Dictionary

 

exothermic

 adjective
adjective
BrE BrE//ˌeksəʊˈθɜːmɪk//
 
; NAmE NAmE//ˌeksoʊˈθɜːrmɪk//
 
(chemistry)
 
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(of a chemical reaction) producing heat compare endothermic Word Origin late 19th cent.: from French exothermique.
See the Oxford Advanced American Dictionary entry: exothermic