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Meaning of “nucleus” in the English Dictionary

"nucleus" in British English

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nucleusnoun [C]

uk   /ˈnjuː.kli.əs/ us   /ˈnuː.kli.əs/ plural nuclei nucleuses
specialized physics the central part of an atom, usually made up of protons and neutrons
specialized biology the part of a cell that controls its growth: DNA is stored in the nucleus of a cell.
the nucleus of sth
the group of people or things that are the most important part of something: These three players will form the nucleus of a revised and stronger team.
(Definition of nucleus from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"nucleus" in American English

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nucleusnoun [C]

us   /ˈnu·kli·əs/ plural nuclei /ˈnu·kliˌɑɪ/
the central part of something
People or things that form the nucleus of something are the most important part of it: These two people will form the nucleus of a new management team to promote sales in South America.
physics A nucleus is the central part of an atom.
biology A nucleus is the central part of a cell that controls its growth.
(Definition of nucleus from the Cambridge Academic Content Dictionary © Cambridge University Press)
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