Source : Webster's Revised Unabridged Dictionary (1913)

Polariscope \Po*lar"i*scope\, n. [Polar + -scope.] (Opt.)
   An instrument consisting essentially of a polarizer and an
   analyzer, used for polarizing light, and analyzing its
   properties.

Source : WordNet®

polariscope
     n : an optical device used to measure the rotation of the plane
         of vibration of polarized light [syn: {polarimeter}]