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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 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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From: WordNet (r) 2.0

 cathode ray
      n : a beam of electrons emitted by the cathode of an electrical
          discharge tube