Source : Webster's Revised Unabridged Dictionary (1913)

Chromatrope \Chro"ma*trope\, n. [Gr. ? color + ? turn, rotation,
   ? to turn.]
   1. (Physics) An instrument for exhibiting certain chromatic
      effects of light (depending upon the persistence of vision
      and mixture of colors) by means of rapidly rotating disks
      variously colored.

   2. A device in a magic lantern or stereopticon to produce
      kaleidoscopic effects.