Dictograph

[dik-tuh-graf, -grahf]

Origin

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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Based on the Random House Dictionary, © Random House, Inc. 2012.
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World English Dictionary

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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Etymonline

Word Origin & History

Dictograph

patented 1907 in U.S. by K.M. Turner and W. Donnan, from dictation + -graph.

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Dictograph

Dic·to·graph