Source : Webster's Revised Unabridged Dictionary (1913)

Stereogram \Ste"re*o*gram\, n. [Stereo- + -gram.]
   A diagram or picture which represents objects in such a way
   as to give the impression of relief or solidity; also, a
   stereograph.

Source : Free On-Line Dictionary of Computing

stereogram
     
        A two-dimensional image which, when viewed correctly appears
        three-dimensional.  E.g. {SIRDS} or {SIRTS}.
     
        {(ftp://katz.anu.edu.au/pub/stereograms)}.
     
        (1994-11-03)