Source : Webster's Revised Unabridged Dictionary (1913)

Radiograph \Ra"di*o*graph\, n. [Radio- + -graph.]
   1. An instrument for measuring and recording solar radiation.

   2. An image or picture produced upon a sensitive surface, as
      of a photographic plate, by some form of radiation other
      than light, as the R["o]ntgen rays, radium rays, etc.;
      esp., a picture of opaque objects traversed by the rays; a
      skiagraph.

Radiograph \Ra"di*o*graph\, v. t.
   To make a radiograph of. -- {Ra`di*og"ra*pher}, n.

Radiograph \Ra"di*o*graph\, n. [Radio- + -graph.] (Phys.)
   A picture produced by the R["o]ntgen rays upon a sensitive
   surface, photographic or fluorescent, especially a picture of
   opaque objects traversed by the rays.

Source : WordNet®

radiograph
     n : a photographic image produced on a radiosensitive surface by
         radiation other than visible light (especially by X-rays
         or gamma rays) [syn: {radiogram}, {shadowgraph}, {skiagraph},
          {skiagram}]