#cathode-ray_tube__cathoderaytube__CRT  a vacuum tube in which a hot cathode emits a beam of electrons that pass through a high voltage anode and are focused or deflected before hitting a phosphorescent screen
  supertype:  gas-discharge_tube__gasdischargetube  a tube in which an electric discharge takes place through a gas
  subtype:  Crookes_tube  kinescope
  part of:  electronic_computer  cathode-ray_oscilloscope  television_system
  part:  electron_gun  the electrode that is the source of electrons in a cathode-ray tube or electron microscope; consists of a cathode that emits a stream of electrons and the electrostatic or electromagnetic apparatus that focuses it
  part:  CRT_screen__screen  display on the surface of the large end of a cathode-ray tube on which is electronically created
     part:  foreground.window  (computer science) a window for an active application

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