: 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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Reports have revealed that lithium-7 has two important uses in nuclear power due to its relative transparency to neutrons.
—
Prabhat Ranjan Mishra, Interesting Engineering, 12 Dec. 2025
Different isotopes of an element all have the same number of protons, but a different number of neutrons, and thus, a different atomic mass.
—Adam Harrington, CBS News, 9 Dec. 2025
Using that definition, scientists can explain basic puzzles about matter, like why protons are always paired with neutrons, and why the energy of an atom comes in discrete quantities.
—Leila Sloman, Quanta Magazine, 3 Dec. 2025
Cosmic rays batter Earth's atmosphere constantly, interacting with molecules of air and producing showers of exotic particles such as muons, high energy neutrons and positrons.
—Tereza Pultarova, Space.com, 3 Dec. 2025
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Prabhat Ranjan Mishra, Interesting Engineering, 12 Dec. 2025
Different isotopes of an element all have the same number of protons, but a different number of neutrons, and thus, a different atomic mass.
—Adam Harrington, CBS News, 9 Dec. 2025
Using that definition, scientists can explain basic puzzles about matter, like why protons are always paired with neutrons, and why the energy of an atom comes in discrete quantities.
—Leila Sloman, Quanta Magazine, 3 Dec. 2025
Cosmic rays batter Earth's atmosphere constantly, interacting with molecules of air and producing showers of exotic particles such as muons, high energy neutrons and positrons.
—Tereza Pultarova, Space.com, 3 Dec. 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 20 Dec. 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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