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

exothermic

adjective

/ˌeksəʊˈθɜːmɪk/

/ˌeksəʊˈθɜːrmɪk/

(chemistry)

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(of a chemical reaction) producing heat compare endothermic
Word Originlate 19th cent.: from French exothermique.

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See exothermic in the Oxford Advanced American Dictionary

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