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cation

noun
🔊/ˈkætaɪən/
🔊/ˈkætaɪən/
 (chemistry化学, physics物理)
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  1. an ion with a positive electrical charge 正离子；阳离子compare anionTopics Physics and chemistryc2
    Word Originmid 19th cent.: from cata ‘alongside’ or from cathode, + ion.