radiometer Syllabification: (ra·di·om·e·ter)Pronunciation: /ˌrādēˈämitər/Definition of radiometer noun an instrument for detecting or measuring the intensity or force of radiation. Derivatives radiometricPronunciation: /-dēəˈmetrik/ adjective radiometricallyPronunciation: /-dēəˈmetrik(ə)lē/ adverb radiometryPronunciation: /-trē/ noun radiometer in other Oxford dictionaries Definition of radiometer in the British & World English dictionary