proton

Pronunciation

• (UK) IPA ^(key): /ˈprəʊ.tɒn/
• (US) IPA ^(key): /ˈproʊ.tɑːn/

• Audio (US)

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Noun

Singular proton

Plural protons

1. (countable) (physics) A proton is a particle that is part of the nucleus of an atom and has a positive charge.

   Scientists think that a proton is made up of quarks.

Related words

• electron
• neutron
• particle
• quark