Dictograph

Dictograph

[dik-tuh-graf, -grahf]
Trademark.
a brand name for a telephonic device with a highly sensitive transmitter obviating the necessity of a mouthpiece: used for listening to conversations secretly or obtaining a record of them.
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Dictograph (ˈdɪktəˌɡrɑːf, -ˌɡræf)
 
n
trademark a telephonic instrument for secretly monitoring or recording conversations by means of a small, sensitive, and often concealed microphone

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

Dictograph
patented 1907 in U.S. by K.M. Turner and W. Donnan, from dictation + -graph.
Online Etymology Dictionary, © 2010 Douglas Harper
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