: 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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On the other hand, nuclear fusion combines two light atomic nuclei—the cores of atoms, consisting of protons and neutrons—into one heavier atomic nucleus.
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Margherita Bassi, Smithsonian Magazine, 18 Apr. 2025
In this process, subatomic particles such as protons and neutrons—and even entire atomic nuclei—could be smashed together, fusing to form heavier nuclei and releasing an enormous amount of energy.
—Phil Plait, Scientific American, 10 Apr. 2025
All of these neutrons can help forge heavy elements.
—Charles Q. Choi, Space.com, 7 Apr. 2025
As things cooled, quarks formed and then condensed into protons and neutrons.
—Quanta Magazine, 2 Apr. 2025
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Margherita Bassi, Smithsonian Magazine, 18 Apr. 2025
In this process, subatomic particles such as protons and neutrons—and even entire atomic nuclei—could be smashed together, fusing to form heavier nuclei and releasing an enormous amount of energy.
—Phil Plait, Scientific American, 10 Apr. 2025
All of these neutrons can help forge heavy elements.
—Charles Q. Choi, Space.com, 7 Apr. 2025
As things cooled, quarks formed and then condensed into protons and neutrons.
—Quanta Magazine, 2 Apr. 2025
See All Example Sentences for neutron
Cite this Entry
“Neutron.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/neutron. Accessed 30 Apr. 2025.
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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