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Definition of cathode noun from the Oxford Advanced Learner's Dictionary

 

cathode

 noun
noun
BrE BrE//ˈkæθəʊd//
 
; NAmE NAmE//ˈkæθoʊd//
 
(specialist)
 
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the electrode in an electrical device where reduction occurs; the negative electrode in an electrolytic cell and the positive electrode in a battery compare anode Word Origin mid 19th cent.: from Greek kathodos ‘way down’, from kata- ‘down’+ hodos ‘way’.
See the Oxford Advanced American Dictionary entry: cathode

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