ventilator Syllabification: (ven·ti·la·tor)Pronunciation: /ˈventəˌlātər/Translate ventilator | into French | into German | into Italian | into Spanish Definition of ventilator noun 1an appliance or aperture for ventilating a room or other space. 2 Medicine an appliance for artificial respiration; a respirator. The ending of ventilator is spelled -or.ventilator in other Oxford dictionaries Definition of ventilator in the British & World English dictionary