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 neutronic (audio) , nyü-​ \ adjective

Examples of neutron in a Sentence

Recent Examples on the Web

The weapons work by accelerating particles without an electric charge—particularly neutrons—to speeds close to the speed of light and directing them against a target. Kyle Mizokami, Popular Mechanics, "The Pentagon Wants to Test a Space-Based 'Particle Beam' by 2023," 18 Mar. 2019 Of special interest are the most neutron-rich nuclei, as astrophysical events proceed in neutron-rich environments. Scientific American, "Readers Respond to the March 2018 Issue," 13 Mar. 2018 Universes with a stronger weak force would have stars with more helium-3, which is a helium atom missing a neutron from its nucleus. Charles Q. Choi, Space.com, "Why Alternate Universes Might Also Host Life Around their Stars," 26 Sep. 2018 Such an unshielded missile would have generated a very intense flux of neutrons, so simply being in close proximity to it would have been lethal. Larry Greenemeier, Scientific American, "Russia’s New Nukes Are Similar to a Risky Project the U.S. Abandoned," 2 Mar. 2018 The Senate also introduced a second bill called the Nuclear Energy Leadership Act (S. 3422) last Thursday, which would direct the DOE to actually establish that fast neutron reactor. Megan Geuss, Ars Technica, "US Congress passes bill to help advanced nuclear power," 16 Sep. 2018 Universes with a weaker weak force would have stars with more deuterium, which is a hydrogen atom with an extra neutron within its nucleus. Charles Q. Choi, Space.com, "Why Alternate Universes Might Also Host Life Around their Stars," 26 Sep. 2018 These observations confirmed that these collisions act as factories for heavy, neutron-rich elements that would be difficult to form in supernovae. John Timmer, Ars Technica, "Neutron-star merger blasted a jet of material through the debris," 5 Sep. 2018 These isotopes differ in the number of neutrons in the oxygen atom and, according to MacLeod, behave slightly differently from one another. Tereza Pultarova, Space.com, "Dino-Killing Asteroid Impact Warmed Earth's Climate for 100,000 Years," 24 May 2018

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

Statistics for neutron

Last Updated

15 Jun 2019

Look-up Popularity

Time Traveler for neutron

The first known use of neutron was in 1921

See more words from the same year

Keep scrolling for more

More Definitions for neutron

neutron

noun

English Language Learners Definition of neutron

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

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

Keep scrolling for more

More from Merriam-Webster on neutron

Rhyming Dictionary: Words that rhyme with neutron

Spanish Central: Translation of neutron

Nglish: Translation of neutron for Spanish Speakers

Britannica.com: Encyclopedia article about neutron

Comments on neutron

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

WORD OF THE DAY

to move with exaggerated bouncy motions

Get Word of the Day daily email!

Test Your Vocabulary

Finance Words Quiz

  • a-piggy-bank
  • The etymology of mortgage is related most closely to which two words?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Word Winder's CrossWinder

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!