neutron

play
noun neu·tron \ˈnü-ˌträn, ˈnyü-\

Definition of neutron

  1. :  an uncharged elementary particle that has a mass nearly equal to that of the proton and is present in all known atomic nuclei except the hydrogen nucleus

neutronic

play \nü-ˈträ-nik, nyü-\ adjective

Recent Examples of neutron from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'neutron'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Origin and Etymology of neutron

probably from neutral


First Known Use: 1921


NEUTRON Defined for English Language Learners

neutron

play
noun

Definition of neutron for English Language Learners

  • physics : a very small particle of matter that has no electrical charge and is part of the nucleus of all atoms except hydrogen atoms


NEUTRON Defined for Kids

neutron

play
noun neu·tron \ˈnü-ˌträn, ˈnyü-\

Definition of neutron for Students

  1. :  a particle that has a mass nearly equal to that of the proton but no electrical charge and that is present in all atomic nuclei except those of hydrogen


Medical Dictionary

neutron

play
noun neu·tron \ˈn(y)ü-ˌträn\

Medical Definition of neutron

  1. :  an uncharged elementary particle that has a mass nearly equal to that of the proton and is present in all known atomic nuclei except the hydrogen nucleus



Seen and Heard

What made you want to look up neutron? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

a lively discussion

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

  • istock-refers-to-this-as-a-tumble-of-strawberries-which-sounded-pretty-nice-to-us
  • Which is a synonym of garner?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!