interferometerPronunciation: /ˌɪntəfəˈrɒmɪtə/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: /-fɛrəˈmɛtrɪk/ adjective interferometricallyPronunciation: /-fɛrəˈmɛtrɪk(ə)li/ adverb interferometry noun interferometer in other Oxford dictionaries Definition of interferometer in the US English dictionary