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cathode ray

a flow of electrons emanating from a cathode in a vacuum tube and focused into a narrow beam.
Origin of cathode ray
First recorded in 1875-80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for cathode rays
Historical Examples
  • They were discovered by Rntgen in the course of his researches with cathode rays.

    Invention Bradley A. Fiske
  • A concise and complete account of the properties of the cathode rays.

  • The power to emit light on heating may be retained for months after the exposure to cathode rays.

    The Nature of Animal Light E. Newton Harvey
  • Fluorescence is most efficiently excited by the cathode rays of a vacuum tube.

    The Nature of Animal Light E. Newton Harvey
  • The spectrum of the salts under excitation of cathode rays is a short continuous one in the blue region.

    The Nature of Animal Light E. Newton Harvey
  • Diamonds, rubies and many minerals fluoresce brilliantly in the path of cathode rays.

    The Nature of Animal Light E. Newton Harvey
  • Fig. 220 shows a Crookes tube fitted with a metal plate, so that the cathode rays coming from C will strike it.

    Things a Boy Should Know About Electricity

    Thomas M. (Thomas Matthew) St. John
  • These rays are invisible and are even given out where the cathode rays strike the glass.

    Things a Boy Should Know About Electricity

    Thomas M. (Thomas Matthew) St. John
  • With his magnet the scientist throws a rope around the cathode rays and drags them whithersoever he will.

    A Man's Value to Society Newell Dwight Hillis
  • This last fact was sufficient of itself to prevent their confusion with the radiant matter “cathode rays” of the tube.

    The Romance of Modern Invention Archibald Williams
British Dictionary definitions for cathode rays

cathode rays

plural noun
a stream of electrons emitted from the surface of a cathode in a valve
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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cathode rays in Medicine

cathode ray cath·ode ray (kāth'ōd')

  1. A stream of electrons emitted by the cathode in electrical discharge tubes.

  2. One of the electrons that is emitted in a stream from a cathode-ray tube.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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cathode rays in Science
cathode ray  
A beam of electrons streaming from the negatively charged end of a vacuum tube (the cathode) toward a positively charged plate (the anode).
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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