Share this entry

neutron Line breaks: neu|tron
Pronunciation: /ˈnjuːtrɒn/

Definition of neutron in English:


A subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.
Example sentences
  • Even the protons and neutrons in the atomic nucleus are believed to made of even smaller particles called quarks.
  • The result would be a star made entirely of neutrons, and these could be packed together as closely as the protons and neutrons in an atomic nucleus.
  • If conditions are right, protons and electrons then fuse into neutrons, creating a neutron star.


Early 20th century: from neutral + -on.

Words that rhyme with neutron


Definition of neutron in:

Share this entry


What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.

Get more from Oxford Dictionaries

Subscribe to remove adverts and access premium resources

Word of the day exemplum
Pronunciation: ɪɡˈzɛmpləm
an example or model...