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nucleus

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nucleus/ˈnuːklijəs/noun
pluralnuclei/ˈnuːkliˌaɪ/alsonucleuses
nucleus
/ˈnuːklijəs/
noun
pluralnuclei/ˈnuːkliˌaɪ/alsonucleuses
Learner's definition of NUCLEUS  
[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
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