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cathode ray

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noun
  1. a flow of electrons emanating from a cathode in a vacuum tube and focused into a narrow beam.
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Origin of cathode ray

First recorded in 1875–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for cathode rays

cathode rays

pl n
  1. a stream of electrons emitted from the surface of a cathode in a valve
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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

cathode rays in Medicine

cathode ray

(kăthōd′)
n.
  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.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

cathode rays in Science

cathode ray

  1. A beam of electrons streaming from the negatively charged end of a vacuum tube (the cathode) toward a positively charged plate (the anode).
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.