The Collaborative International Dictionary of English v.0.48:

Fluoroscope \Flu*or"o*scope\, n. [Fluorescence + -scope.]
   1. (Phys.) An instrument for observing or exhibiting
      fluorescence.
      [1913 Webster]

   2. (Physics) A fluorescent screen, with hood to protect the
      eyes, used for observing the shadows cast by objects
      placed in the path of the X rays. -- Flu*or`o*scop"ic,
      a.
      [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

fluoroscope
    n 1: an X-ray machine that combines an X-ray source and a
         fluorescent screen to enable direct observation [syn:
         fluoroscope, roentgenoscope]