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    electron

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    electron
    e‧lec‧tron /ɪˈlektrɒn $ -trɑːn/ noun [countable]
     Date: 1800-1900
     Origin: electro- + -on (as in ion)
    a very small piece of matter with a negative electrical charge that moves around the nucleus (=central part) of an atom ⇨ proton, neutron