Cath"ode (?), n. [Gr. descent; down + way.] 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<-- X-ray -->.
© Webster 1913.