Dictograph

[ dik-tuh-graf, -grahf ]
/ ˈdɪk təˌgræf, -ˌgrɑf /

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.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for dictograph

British Dictionary definitions for dictograph

Dictograph
/ (ˈdɪktəˌɡrɑːf, -ˌɡræf) /

noun

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