neutron

noun

neu·​tron ˈnü-ˌträn 

ˈnyü-

: 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

nü-ˈträ-nik 

nyü-

adjective

Examples of neutron in a Sentence

Recent Examples on the Web

While a heavier form of rainwater with one neutron falls first, a lighter form with no neutrons falls after. —Jack Knudson, Discover Magazine, 23 June 2025

The reactors utilize fast neutrons and liquid-metal cooling, bypassing the complexities of high-pressure systems while enhancing fuel efficiency and safety. —Trefis Team, Forbes.com, 26 June 2025

At the same time, atomic nuclei are dissolved into their component parts, releasing more free neutrons to power the r process. —Mohammed Soliman, MSNBC Newsweek, 28 Apr. 2025

Beyond electrons, the quarks that make up protons and neutrons in atomic nuclei are also fermions. —Matt Von Hippel, Quanta Magazine, 23 June 2025

Word History

Etymology

probably from neutral

First Known Use

1921, in the meaning defined above

Phrases Containing neutron

• neutron activation analysis
• neutron bomb
• neutron star

Rhymes for neutron

• anton
• argon
• axon
• baronne
• baryon
• baton
• boron
• buisson
• bygone
• capon
• cardon
• chiffon

Kids Definition

neutron

noun

neu·​tron ˈn(y)ü-ˌträn 

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

Medical Definition

neutron

noun

neu·​tron ˈn(y)ü-ˌträn 

: 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