A"ër*o*phone` (?), n. [Aëro- + 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