The Collaborative International Dictionary of English v.0.48:
Stereopticon \Ste`re*op"ti*con\, n. [NL. See Stereo-, and
Optic.]
An instrument, consisting essentially of a magic lantern in
which photographic pictures are used, by which the image of a
landscape, or any object, may be thrown upon a screen in such
a manner as to seem to stand out in relief, so as to form a
striking and accurate representation of the object itself;
also, a pair of magic lanterns for producing the effect of
dissolving views.
[1913 Webster]