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.
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for dictograph
Historical Examples of dictograph
There's only one way to get what we want and that is to use a dictograph.
The dictograph, which had been all sound a moment before, was as mute as a cigar-box.
Theres a dictograph in the room you occupied, my dear, observed the monocle-man.
"The dictograph," I whispered to Rolston, and he pressed my arm to show he understood.
That was the day she and Dean were planning to put in a dictograph.
British Dictionary definitions for dictograph
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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for dictograph
patented 1907 in U.S. by K.M. Turner and W. Donnan, from dictation + -graph "instrument for recording; something written."
Online Etymology Dictionary, © 2010 Douglas Harper