cathode ray

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

Origin:
1875–80

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

cathode ray cath·ode ray (kāth'ōd')
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.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
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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