Cath·ode n. Physics The part of a voltaic battery by which the electric current leaves substances through which it passes, or the surface at which the electric current passes out of the electrolyte; the negative pole; -- opposed to anode.
Cathode ray Phys., a kind of ray generated at the cathode in a vacuum tube, by the electrical discharge.
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cathode ray
n : a beam of electrons emitted by the cathode of an electrical
discharge tube