ultrophone

Noun

ultraphone (plural ultraphones)

1. A telephone capable of transmitting communications faster than the speed of light.
   • Amalfi wondered if the Hruntans understood English; not that he was worried about the present interchange being overheard—the giant planet would block that most effectively, since the Utopians used ordinary radio rather than ultraphones or Dirac communicators—but it was of the utmost importance, if...1955, James Blish, Earthman, Come Home (Cities in Flight; 1), New York, N.Y.: Avon Books, published 1958, page 29