The Collaborative International Dictionary of English v.0.48:

Sciagraph \Sci"a*graph\, n. [See Sciagraphy.]
   1. (Arch.) An old term for a vertical section of a building;
      -- called also sciagraphy. See Vertical section, under
      Section.
      [1913 Webster]

   2. (Phys.) A radiograph. [Written also skiagraph.]
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Skiagraph \Ski"a*graph\, n. Skiagraphy \Ski*ag"ra*phy\, n., etc.
   See Sciagraph, Sciagraphy, etc.
   [Webster 1913 Suppl.] Skiascope

WordNet (r) 3.0 (2006):

skiagraph
    n 1: 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, skiagraph, skiagram]