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

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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

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 The building blocks of atoms, protons and neutrons, are composed of a collection of particles called quarks and gluons. John Timmer, Ars Technica, "Atoms may come apart as the Universe’s biggest stars explode," 24 Oct. 2018 The new results suggest that neutron-star mergers are important sources of short-duration gamma-ray bursts, study team members said. Mike Wall, Space.com, "Faster Than Light? Neutron-Star Merger Shot Out a Jet with Seemingly Impossible Speed," 5 Sep. 2018 When this collision occurs, the proton transforms into a neutron and ejects a positron, the antimatter version of an electron. Kenneth Chang, New York Times, "How to Spot a Nuclear Bomb Program? Look for Ghostly Particles," 27 Mar. 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.

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First Known Use of neutron

1921, in the meaning defined above

History and Etymology for neutron

probably from neutral

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Statistics for neutron

Last Updated

20 Apr 2019

Look-up Popularity

Time Traveler for neutron

The first known use of neutron was in 1921

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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

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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

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