Giving off heat; exothermic or releasing thermal energy as a characteristic of a process or reaction.
From Greek exō (outside) + thermē (heat) + -ous (full of). This older variant form emphasizes the quality of being full of or characterized by external heat release.
Though less common than exothermic today, exothermous shows how scientists tried different word-forms to express the same concept—kind of like how we say 'happy' or 'gladsome' for almost the same idea!
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