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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
1875-80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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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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