cathode ray


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

Nearby words

  1. catho,
  2. cathodal,
  3. cathode,
  4. cathode dark space,
  5. cathode glow,
  6. cathode rays,
  7. cathode-ray tube,
  8. cathodic,
  9. cathodic protection,
  10. cathodoluminescence

Origin of cathode ray

First recorded in 1875–80 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for cathode rays

cathode rays

pl n

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

Medicine definitions for cathode rays

cathode ray



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

Science definitions for cathode rays

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.