The Collaborative International Dictionary of English v.0.48:

Fluoroscopy \Flu`or*os"co*py\, n.
   Examination of an object, as the human body, by exposing it
   to the X rays and observing the shadow cast upon a
   fluorescent screen; cryptoscopy.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

fluoroscopy
    n 1: examination of body structures using a fluoroscope