cathode ray

cathode ray

n.

1. An electron emitted from the cathode of an electrical discharge tube, such as a cathode-ray tube.

2. A narrow beam of such electrons.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

cath′ode ray`

n.

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

[1875–80]

Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

cathode ray

A beam of electrons streaming from the cathode (positively charged end) of a vacuum tube. When cathode rays strike the anode (negatively charged end) of the vacuum tube with sufficiently high energy, they produce x-rays.

The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Thesaurus

Noun

1.

cathode ray - a beam of electrons emitted by the cathode of an electrical discharge tube electron beam, beam, ray - a group of nearly parallel lines of electromagnetic radiation

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