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cathode has no recorded synonym. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is anode.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
a negatively charged electrode that is the source of electrons entering an electrical device
the positively charged terminal of a voltaic cell or storage battery that supplies current
Synonyms, antonyms and the broader and narrower relations for cathode come from Princeton University’s WordNet. Full sources and licences.