: 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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The team highlighted that during experiments at NIF, lasers heated the capsules to extremely high temperatures, causing thermonuclear reactions that produced neutrons.
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Prabhat Ranjan Mishra, Interesting Engineering, 9 Jan. 2026
This has led scientists to suggest a whole host of hypothetical particles to account for dark matter, which go beyond the standard model of particle physics and the electrons, protons and neutrons that make up the atoms that compose all everyday matter, like stars, planets, moons and our bodies.
—Robert Lea, Space.com, 9 Jan. 2026
This alone isn't enough for nuclear fission to sustain itself, but at Oklo, groundwater that flowed through these rocks acted as a natural neutron moderator – similarly to how water is used in many of today's reactors.
—New Atlas, 8 Jan. 2026
But if the mass of the collapsing star is between 1 and 3 solar masses, the neutrons can stop the star from collapsing further, and a neutron star remains, as explained by NASA.
—Adam Harrington, CBS News, 23 Dec. 2025
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“Neutron.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/neutron. Accessed 20 Jan. 2026.
Kids 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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