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  • noun
    /ˈnuːklijəs/ , pl nuclei /ˈnuːkliˌaɪ/ also nucleuses
    [count] biology :the central part of most cells that contains genetic material and is enclosed in a membrane
    physics :the central part of an atom that is made up of protons and neutrons
    a central or most important part of something - usually + of
    players who are the nucleus [=coreof the team