interferometer Syllabification: (in·ter·fer·om·e·ter)Pronunciation: /ˌintərfəˈrämitər/Definition of interferometer noun Physics an instrument in which wave interference is employed to make precise measurements of length of displacement in terms of the wavelength. Derivatives interferometricPronunciation: /-ˌfi(ə)rəˈmetrik/ adjective interferometrically adverb interferometryPronunciation: /-trē/ noun interferometer in other Oxford dictionaries Definition of interferometer in the British & World English dictionary