Source : Webster's Revised Unabridged Dictionary (1913)

Cosmorama \Cos`mo*ra"ma\ (k?z`m?-r?"m? or -r?"m?), n. [NL., fr.
   Gr. ko`smos the world + ??? a sight, spectacle, fr. ??? to
   see.]
   An exhibition in which a series of views in various parts of
   the world is seen reflected by mirrors through a series of
   lenses, with such illumination, etc., as will make the views
   most closely represent reality.