loudspeaker Syllabification: (loud·speak·er)Pronunciation: /ˈloudˌspēkər/Translate loudspeaker | into French | into German | into Italian | into Spanish Definition of loudspeaker noun an apparatus that converts electrical impulses into sound, typically as part of a public address system or stereo equipment. loudspeaker in other Oxford dictionaries Definition of loudspeaker in the British & World English dictionary