detectophone
detectophone
(dɪˈtɛktəˌfəʊn)n
a secret listening device, the predecessor of the modern 'bug'(in science fiction) a voice-activated device(in science fiction) a machine capable of translating between languages
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014