American Dictionary

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Definition nucleus in American English

nucleus noun

[countable] noun
/ˈnukliəs/
1

the central or basic part of something

Example

These two groups formed the nucleus of a new political party.

Example

A nucleus of activist students led the demonstrations.

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2

the central part of an atom, consisting of protons and neutrons

Synonyms and related words
2.1

the part of a cell that contains the chromosomes

Synonyms and related words
Definition nucleus in American English