Source : Webster's Revised Unabridged Dictionary (1913)

Skiagraph \Ski"a*graph\, n. Skiagraphy \Ski*ag"ra*phy\, n., etc.
   See {Sciagraph}, {Sciagraphy}, etc.

Source : WordNet®

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