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    proton

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    proton
    pro‧ton /ˈprəʊtɒn $ ˈproʊtɑːn/ noun [countable]
     Date: 1800-1900
     Language: Greek
     Origin: 'first thing', from protos; ⇨ proto-
    a very small piece of matter with a positive electrical charge that is in the central part of an atom ⇨ electron, neutron