calorimeterPronunciation: /ˌkaləˈrɪmɪtə/Definition of calorimeter noun an apparatus for measuring the amount of heat involved in a chemical reaction or other process. Derivatives calorimetricPronunciation: /-ˈmɛtrɪk/ adjective calorimetry noun Origin: late 18th century: from Latin calor 'heat' + -metercalorimeter in other Oxford dictionaries Definition of calorimeter in the US English dictionary