: 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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Ruotsalainen observed that the atomic nuclei, which consist of electrically positive protons and electrically neutral neutrons, moved in circular paths inside the trap, under a powerful magnetic field.
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Georgina Jedikovska, Interesting Engineering, 8 Oct. 2025
This new particle, the neutron, finally completed the basic picture of the atom.
—Ethan Siegel, Big Think, 30 Sep. 2025
Because protons and neutrons are shielded from many environmental disturbances, those transitions may carry the subtle imprint of dark matter.
—New Atlas, 16 Sep. 2025
Understanding quark-gluon plasma could reveal what conditions in the universe were like in its first microseconds and how this gave way to protons and neutrons — and eventually, the matter that populates the cosmos today.
—Robert Lea, Space.com, 5 Sep. 2025
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Georgina Jedikovska, Interesting Engineering, 8 Oct. 2025
This new particle, the neutron, finally completed the basic picture of the atom.
—Ethan Siegel, Big Think, 30 Sep. 2025
Because protons and neutrons are shielded from many environmental disturbances, those transitions may carry the subtle imprint of dark matter.
—New Atlas, 16 Sep. 2025
Understanding quark-gluon plasma could reveal what conditions in the universe were like in its first microseconds and how this gave way to protons and neutrons — and eventually, the matter that populates the cosmos today.
—Robert Lea, Space.com, 5 Sep. 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 19 Oct. 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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