neutron

noun
neu·​tron | \ ˈnü-ˌträn How to pronounce neutron (audio) , ˈnyü- \

Definition of neutron

: 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

Keep scrolling for more

Other Words from neutron

neutronic \ nü-​ˈträ-​nik How to pronounce neutron (audio) , nyü-​ \ adjective

Examples of neutron in a Sentence

Recent Examples on the Web Astronomers realized subsequently that there are, in fact, some 100 million neutron stars in our Milky Way galaxy alone—and a billion times more in the observable universe. Avi Loeb, Scientific American, 26 Sep. 2021 Most pulsars are now understood to be neutron stars, the extraordinarily dense husks of collapsed supergiants. Washington Post, 18 Sep. 2021 Most pulsars are now understood to be neutron stars, the extraordinarily dense husks of collapsed supergiants. BostonGlobe.com, 18 Sep. 2021 Heavy water is a rarer version of the far more commonplace H2O, or normal water, in which ordinary hydrogen has been replaced with deuterium—that is, with hydrogen atoms bearing an extra neutron. Robin George Andrews, Scientific American, 2 June 2021 The answer is quite a lot, according to scientists trying to understand the nature of matter in neutron stars, the early universe and other extreme conditions. Frank Wilczek, WSJ, 29 July 2021 The Office of Science is the main U.S. builder of large scientific machines such as atom smashers, x-ray synchrotrons, and neutron sources. Adrian Cho, Science | AAAS, 27 May 2021 The basic structure of beta decay is a neutron decays into a proton, electron, and neutrino. Don Lincoln, Forbes, 18 May 2021 The neutron beam scatters according to the chemical makeup of the metal scrap. Caroline Delbert, Popular Mechanics, 15 Feb. 2021

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.

See More

First Known Use of neutron

1921, in the meaning defined above

History and Etymology for neutron

probably from neutral

Keep scrolling for more

Learn More About neutron

Time Traveler for neutron

Time Traveler

The first known use of neutron was in 1921

See more words from the same year

Statistics for neutron

Last Updated

1 Oct 2021

Cite this Entry

“Neutron.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/neutron. Accessed 21 Oct. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon
Seen & Heard
People are talking about

Keep scrolling for more

More Definitions for neutron

neutron

noun

English Language Learners Definition of neutron

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

neutron

noun
neu·​tron | \ ˈnü-ˌträn How to pronounce neutron (audio) , ˈnyü- \

Kids Definition of neutron

: 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

neutron

noun
neu·​tron | \ ˈn(y)ü-ˌträn How to pronounce neutron (audio) \

Medical Definition of neutron

: 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

More from Merriam-Webster on neutron

Nglish: Translation of neutron for Spanish Speakers

Britannica.com: Encyclopedia article about neutron

WORD OF THE DAY

Test Your Vocabulary

Difficult Spelling Words Quiz

  • alphabet pasta spelling help
  • Which is the correct spelling?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

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!