The Collaborative International Dictionary of English v.0.48:

loudspeaker \loud"speak*er\ n.
   A device which converts electrical signals into sounds loud
   enough to be heard at a distance, usually outdoors; it is
   used to amplify or transmit over a distance speech from a
   person, who is typically speaking into a microphone.
   Sometimes it is used to play recorded speech or music.

   Syn: speaker, speaker unit, loudspeaker system, speaker
        system.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

loudspeaker
    n 1: electro-acoustic transducer that converts electrical
         signals into sounds loud enough to be heard at a distance
         [syn: loudspeaker, speaker, speaker unit,
         loudspeaker system, speaker system]

The Free On-line Dictionary of Computing (19 January 2023):

loudspeaker

    An electromechanical device for converting
   an electrical signal into sound.

   (2008-10-09)