nucleus Definition in the Cambridge English Dictionary
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Definition of “nucleus” - English Dictionary

Definition of "nucleus" - American English Dictionary

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nucleusnoun [C]

 us   /ˈnu·kli·əs/ (plural nuclei  /ˈnu·kliˌɑɪ/ )
the ​centralpart of something People or things that ​form the nucleus of something are the most ​importantpart of it: These two ​people will ​form the nucleus of a new ​managementteam to ​promotesales in ​SouthAmerica. physics A nucleus is the ​centralpart of an ​atom. biology A nucleus is the ​centralpart of a ​cell that ​controlsitsgrowth.
(Definition of nucleus from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "nucleus" - British English Dictionary

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nucleusnoun [C]

uk   /ˈnjuː.kli.əs/  us   /ˈnuː-/ (plural nuclei or nucleuses)
specialized physics the ​centralpart of an ​atom, usually made up of protons and neutrons specialized biology the ​part of a ​cell that ​controlsitsgrowth: DNA is ​stored in the nucleus of a ​cell.the nucleus of sth the ​group of ​people or things that are the most ​importantpart of something: These three ​players will form the nucleus of a ​revised and ​strongerteam.
(Definition of nucleus from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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