発はつ熱ねつ反はん応のうMeaningsNoun1. exothermic reaction; exothermal reaction; exoergic reactionKanji used発let out熱heat反be against応respond with actionComposed of発はつ熱ねつgeneration of heat; (attack of) fever; pyrexiaNoun反はん応のうreaction; response; physical reaction (to a stimulus); observable response (of an organism); effect; changeNoun