Source : Webster's Revised Unabridged Dictionary (1913)

Radioscopy \Ra`di*os"co*py\, n. [Radio- + -scopy.]
   Direct observation of objects opaque to light by means of
   some other form of radiant energy, as the R["o]ntgen rays. --
   {Ra`di*o*scop"ic}, {*scop"ic*al}, a.

Source : WordNet®

radioscopy
     n : (radiology) examination of the inner structure of opaque
         objects using X rays or other penetrating radiation [syn:
          {radiology}]