respirator Syllabification: (res·pi·ra·tor)Pronunciation: /ˈrespəˌrātər/Translate respirator | into French | into Italian | into Spanish Definition of respirator noun an apparatus worn over the mouth and nose or the entire face to prevent the inhalation of dust, smoke, or other noxious substances. an apparatus used to induce artificial respiration. Remember that respirator ends with -or.respirator in other Oxford dictionaries Definition of respirator in the British & World English dictionary