nucleus

Pronunciation

• (UK) IPA ^(key): /ˈnjuː.kli.əs/
• (US) IPA ^(key): /ˈnuːkli.əs/

• Audio (US)

  (file)

Noun

Singular nucleus

Plural nuclei or nucleuses

1. (countable) A nucleus is the central part of something, such as a cell or an atom.

   Our cells store their genetic information in their nucleus.

   The nucleus of an atom is made up of protons and neutrons.