reflector Syllabification: (re·flec·tor)Pronunciation: /riˈflektər/Translate reflector | into French | into German | into Italian | into Spanish Definition of reflector noun a piece of glass, metal, or other material for reflecting light in a required direction, e.g., a red one on the back of a motor vehicle or bicycle. an object or device that reflects radio waves, seismic vibrations, sound, or other waves. a reflecting telescope. The ending of reflector is spelled -or.reflector in other Oxford dictionaries Definition of reflector in the British & World English dictionary