Source : Webster's Revised Unabridged Dictionary (1913)

Radiophone \Ra"di*o*phone\, [Radio- + Gr. ? sound.] (Physics)
   An apparatus for the production of sound by the action of
   luminous or thermal rays. It is essentially the same as the
   photophone.

Source : WordNet®

radiophone
     n : a telephone that communicates by radio waves rather than
         along cables [syn: {radiotelephone}, {wireless telephone}]