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definition of the word nucleus

by the Wiktionnary

Wikipedia has an article on:
Nucleus

Wikipedia

From Latin nucleus (kernel) derived from nux (nut).

Singular
nucleus

Plural
nuclei or nucleuses

nucleus (plural nuclei or nucleuses)

  1. (chemistry, physics) The massive, positively charged central part of an atom made up of protons and neutrons.
  2. (cytology) A large organelle found in cells which contains genetic material.
  3. The central part (of something), round which others are collected.
  4. An initial part that will receive additions.
    This collection will form the nucleus of a new library.
  5. (neuroanatomy) A cluster of many neuronal bodies where synapsing occurs.


Definition from Wiktionary
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