from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A stream of electrons emitted by the cathode in electrical discharge tubes.
  • n. One of the electrons that is emitted in a stream from a cathode-ray tube.

from the GNU version of the Collaborative International Dictionary of English

  • n. a kind of ray generated at the cathode in a vacuum tube, by the electrical discharge.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a beam of electrons emitted by the cathode of an electrical discharge tube


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