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.
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