• Abbreviation of cathode ray tube. An evacuated electron tube which converts electrical signals into a visible form. In it, one or more electron guns produce one or more electron beams which are deflected and focused, en route to striking a phosphor surface on the back of the viewing screen. This surface glows, producing the visible images on the front of the screen. Used extensively as the display unit in computer monitors, TVs, oscilloscopes, automated teller machines, and so on. Also, such a tube and its housing.
  • acronym for cathode-ray tube

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