The Collaborative International Dictionary
Auxetophone \Aux*e"to*phone\, n. [Gr. ? that may be increased + ? sound, voice.] A pneumatic reproducer for a phonograph, controlled by the recording stylus on the principle of the relay. It produces much clearer and louder tones than does the ordinary vibrating disk reproducer. [obsolescent]
n. (context historical English) A pneumatic type of sound-playback device used in the early part of the twentieth century.