atom

Pronunciation

• IPA ^(key): /ˈætəm/

• Audio (US)

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Noun

Singular atom

Plural atoms

1. (countable) An atom is the smallest bit that matter can be broken down into.

   Atoms of hydrogen make up a water molecule.

2. (countable) A particle which is made up of protons, neutrons, and electrons.

Related words

• atomize/atomise