the electrode in an electrical device where reduction occurs; the negative electrode in an electrolytic cell and the positive electrode in a battery 阴极；（电解池的）负极；（原电池的）正极 Oxford Collocations DictionaryCathode is used before these nouns:- ray
Word Originmid 19th cent.: from Greek kathodos ‘way down’, from kata- ‘down’+ hodos ‘way’.