: 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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While usually utilized to refine the resonance parameters from experimental data, SAMMY now helped the team identify unknown materials by matching neutron resonance signatures from Venus.
—
Georgina Jedikovska, Interesting Engineering, 28 May 2026
Tyson went on to note that the neutron was discovered by James Chadwick the year after Shatner was born.
—Kimberly Nordyke, HollywoodReporter, 21 May 2026
Its lack of interaction with light means it can't be composed of protons, neutrons and electrons — the particles that compose atoms.
—Robert Lea, Space.com, 15 May 2026
Building a Treasure Map Helium-3 is an isotope of helium that possesses one fewer neutron than its run-of-the-mill counterpart, helium-4, which is the only other stable helium isotope.
—Robin George Andrews, Scientific American, 14 May 2026
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Georgina Jedikovska, Interesting Engineering, 28 May 2026
Tyson went on to note that the neutron was discovered by James Chadwick the year after Shatner was born.
—Kimberly Nordyke, HollywoodReporter, 21 May 2026
Its lack of interaction with light means it can't be composed of protons, neutrons and electrons — the particles that compose atoms.
—Robert Lea, Space.com, 15 May 2026
Building a Treasure Map Helium-3 is an isotope of helium that possesses one fewer neutron than its run-of-the-mill counterpart, helium-4, which is the only other stable helium isotope.
—Robin George Andrews, Scientific American, 14 May 2026
See All Example Sentences for neutron
Cite this Entry
“Neutron.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/neutron. Accessed 3 Jun. 2026.
Copy CitationKids 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
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