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| i·on [ ən, òn ] (plural i·ons) |
noun |
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| Definition: |
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electrically charged atom or atom group: an atom or group of atoms that has acquired an electric charge by losing or gaining one or more electrons
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| [Mid-19th century. < Greek, "moving thing" < present participle of ienai "go"; because an ion moves toward the electrode of opposite charge] |
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