 The term was coined by Marcellin Berthelot from the Greek roots "endo-", derived from the word "endon" (ἔνδον) meaning "within", and the root "therm" (θερμ-), meaning "hot" or "warm" in the sense that a reaction depends on absorbing heat if it is to proceed.The opposite of an endothermic process is an exothermic process, one that releases, "gives out" energy in the form of heat.Thus in each term (endothermic & exothermic) the prefix refers to where heat goes as the reaction occurs, though in reality it only refers to where the energy goes, without necessarily being in the form of heat.