1) Beam in a vacuum tube 2) Crookes tube emission 3) TV tube emission 4) Vacuum tube type 
A negatively charged beam that emanates from the cathode of a discharge tube. Cathode rays are streams of electrons.
Cathode rays (also called an electron beam or e-beam) are streams of electrons observed in vacuum tubes. If an evacuated glass tube is equipped with two electrodes and a voltage is applied, the glass opposite of the negative electrode is observed to glow, due to electrons emitted from and travelling perpendicular to the cathode (the electrode conn...
stream of electrons leaving the negative electrode (cathode) in a discharge tube containing a gas at low pressure, or electrons emitted by a heated ... [7 related articles]
<physics> Electrons emitted from the surface of a cathode in a vacuum tube. ... (16 Mar 1998) ... 
[n] - a beam of electrons emitted by the cathode of an electrical discharge tube
An electron emitted from the negative electrode in an evacuated tube. See also: Cathode Ray Tube, Electron.
noun a beam of electrons emitted by the cathode of an electrical discharge tube
Stream of fast-moving electrons that travel from a cathode (negative electrode) towards an anode (positive electrode) in a vacuum tube. They carry a negative charge and can be deflected by electric and magnetic fields. Cathode rays focused into fine beams of fast electrons are used in cathode-ray tubes, the electrons' kinetic energy bei...