From The Collaborative International Dictionary of English v.0.44 [gcide]:
loudspeaker \loudspeaker\ 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.
From WordNet (r) 2.0 [wn]:
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
30 Moby Thesaurus words for "loudspeaker": acoustical network, capacitor speaker, coaxial speaker, cone, crossover network, diaphragm, dynamic speaker, earphone, electrodynamic speaker, electromagnetic speaker, electrostatic speaker, excited-field speaker, full-fidelity speaker, headphone, headset, high-fidelity speaker, high-frequency speaker, horn, low-frequency speaker, midrange speaker, monorange speaker, moving-coil speaker, permanent magnet speaker, speaker, speaker system, speaker unit, triaxial speaker, tweeter, voice coil, woofer
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