cathode rays

noun

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

pl n

1. a stream of electrons emitted from the surface of a cathode in a valve

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.

1. A beam of electrons streaming from the negatively charged end of a vacuum tube (the cathode) toward a positively charged plate (the anode).