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TOEFL BNC: 6303 COCA: 10273

ion

noun
/ˈaɪən/, /ˈaɪɒn/
/ˈaɪən/, /ˈaɪɑːn/
(physics物理 or chemistry化学)
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  1. an atom or a molecule with a positive or negative electric charge caused by its losing or gaining one or more electrons离子Topics Physics and chemistryc2
    Word Originmid 19th cent.: from Greek, neuter present participle of ienai ‘go’.

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