: 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
Examples of neutron in a Sentence
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So, just as red light, green light, and blue light blend to make white, so do red, blue, and green quarks form color-neutral protons and neutrons (the building blocks of atoms).
—
Quanta Magazine, 15 June 2026
Those neutrons, however, do not care how they are used.
—Rupendra Brahambhatt, Interesting Engineering, 14 June 2026
There are isotopes present that will also release additional neutrons, allowing this process to generate sufficient fuel.
—ArsTechnica, 9 June 2026
As uranium 238 is bombarded with neutrons inside the reactor, the molecules absorb some of these particles and become the heavier uranium 239, which rapidly decays and eventually becomes extremely radioactive plutonium.
—Adam Kovac, Scientific American, 28 May 2026
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Quanta Magazine, 15 June 2026
Those neutrons, however, do not care how they are used.
—Rupendra Brahambhatt, Interesting Engineering, 14 June 2026
There are isotopes present that will also release additional neutrons, allowing this process to generate sufficient fuel.
—ArsTechnica, 9 June 2026
As uranium 238 is bombarded with neutrons inside the reactor, the molecules absorb some of these particles and become the heavier uranium 239, which rapidly decays and eventually becomes extremely radioactive plutonium.
—Adam Kovac, Scientific American, 28 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 16 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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