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atom

From Wiktionary
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The Simple English Wikipedia has an article on:

Pronunciation[change]

Noun[change]

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. A particle which is made up of protons, neutrons, and electrons.

Related words[change]