: 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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The relation is derived partially from the principles of quantum chromodynamics, or QCD, which is the theory of how the strong force binds particles called quarks to form particles such as neutrons.
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Keith Cooper, Space.com, 24 Oct. 2025
In 1932, Ioffe’s student Dmitrii Ivanenko came up with the neutron-proton model of the atom.
—Literary Hub, 23 Oct. 2025
Plutonium is also the principal fuel in a fast neutron reactor, and in any reactor, it is progressively bred from non-fissile U-238 that comprises over 99 percent of natural uranium.
—Prabhat Ranjan Mishra, Interesting Engineering, 23 Oct. 2025
And that each electron is tiny in mass compared to each proton, neutrons, and atomic nucleus.
—Big Think, 16 Oct. 2025
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Keith Cooper, Space.com, 24 Oct. 2025
In 1932, Ioffe’s student Dmitrii Ivanenko came up with the neutron-proton model of the atom.
—Literary Hub, 23 Oct. 2025
Plutonium is also the principal fuel in a fast neutron reactor, and in any reactor, it is progressively bred from non-fissile U-238 that comprises over 99 percent of natural uranium.
—Prabhat Ranjan Mishra, Interesting Engineering, 23 Oct. 2025
And that each electron is tiny in mass compared to each proton, neutrons, and atomic nucleus.
—Big Think, 16 Oct. 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 29 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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