Word.ws English Dictionary

nuclei

UK/ˈnjuː.kli.aɪ//ˈnuːkli.aɪ/

nuclei is the plural of nucleus.

Meaning of nucleus

Noun

nucleus (plural nuclei or nucleuses)

  1. The core, central part of something, around which other elements are assembled.
    • Situated in the centre of the largest agricultural basin in northern Formosa, T’ai-pei (population in 1964 was estimated to be 1,117,000) forms the nucleus of a major industrial area. The T’ai-pei industrial complex includes light and heavy industies within the urbanized area and also in several...1968, Norton S. Ginsburg, “T’AI-PEI”, in Encyclopedia Britannica, volume 21, →LCCN, →OCLC, page 627, column 2
  2. An initial part or version that will receive additions.
    • This collection will form the nucleus of a new library.
  3. The massive, positively charged central part of an atom, made up of protons and neutrons.
  4. A large membrane-enclosed organelle found in eukaryotic cells which contains genetic material.
  5. A ganglion, cluster of many neuronal bodies where synapsing occurs.
  6. The central part of a syllable, most commonly a vowel.

See all 7 meanings of nucleus

Forms of nuclei

alternative formnucleuses

Phrases with nuclei

11 more phrasesFewer phrases

Questions about nuclei

What is nuclei the plural of?
Nuclei is the plural of nucleus.
How do you pronounce nuclei?
Nuclei is pronounced /ˈnjuː.kli.aɪ/ (UK).

Words near nuclei in the dictionary

  1. nucleation
  2. nucleations
  3. nucleative
  4. nucleator
  5. nucleators
  6. nuclei
  7. nucleic
  8. nucleic acid
  9. nucleic acid test
  10. nucleic acid tests
  11. nucleic acids

Source and license

Adapted from Wiktionary: nuclei (page history and authors); nucleus (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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