Dictionary.net

• 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.

2010 - New Age Dictionary Database
By Oddity Software

• 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.

1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.