From The Collaborative International Dictionary of English v.0.48 [gcide]:
Aerophone \A"["e]r*o*phone'\, noun [A["e]ro- + Gr. ? voice.] (a) A form of combined speaking and ear trumpet. (b) An instrument, proposed by Edison, for greatly intensifying speech. It consists of a phonograph diaphragm so arranged that its action opens and closes valves, producing synchronous air blasts sufficient to operate a larger diaphragm with greater amplitude of vibration. [Webster 1913 Suppl.]
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