calorimeter Syllabification: (cal·o·rim·e·ter)Pronunciation: /ˌkaləˈrimitər/Definition of calorimeter noun an apparatus for measuring the amount of heat involved in a chemical reaction or other process. Derivatives calorimetricPronunciation: /ˌkalərəˈmetrik/ adjective calorimetryPronunciation: /-ˈrimitrē/ noun Origin: late 18th century: from Latin calor 'heat' + -metercalorimeter in other Oxford dictionaries Definition of calorimeter in the British & World English dictionary