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cryptophone ‎(plural cryptophones)

  1. A telephone that provides security against eavesdropping and electronic surveillance.
    • 2008 March 12, Peter Wayner, “Psst! Follow Me and I’ll Show You the Exhibition”, in New York Times[1]:
      The bulky refrigerator-size boxes that scrambled the phone discussions of Roosevelt and Churchill are just steps from the hefty cryptophones of the 1970s and more modern versions.