spectroscopy Syllabification: (spec·tros·co·py)Pronunciation: /spekˈträskəpē/Definition of spectroscopy noun the branch of science concerned with the investigation and measurement of spectra produced when matter interacts with or emits electromagnetic radiation. Derivatives spectroscopicPronunciation: /ˌspektrəˈskäpik/ adjective spectroscopicallyPronunciation: /ˌspektrəˈskäpik(ə)lē/ adverb spectroscopistPronunciation: /-pist/ noun spectroscopy in other Oxford dictionaries Definition of spectroscopy in the British & World English dictionary