: 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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That tells researchers that dark matter can't be made of atoms like everyday matter is, because the particles that comprise atoms — electrons, protons, and neutrons — do interact with light.
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Robert Lea, Space.com, 28 Feb. 2025
Isotopes are atoms of the same element that have the same number of protons but a different number of neutrons.
—Daniel R. Depetris, Newsweek, 11 Jan. 2025
Quarks are the particles in the standard model of particle physics that bind together and comprise particles like protons and neutrons.
—Robert Lea, Space.com, 21 Feb. 2025
Instead of fuel rods stuck in pressurized water as a neutron moderator and coolant, these reactors use nuclear fuel mixed with molten salt at normal atmospheric pressure.
—David Szondy, New Atlas, 20 Feb. 2025
See All Example Sentences for neutron
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Robert Lea, Space.com, 28 Feb. 2025
Isotopes are atoms of the same element that have the same number of protons but a different number of neutrons.
—Daniel R. Depetris, Newsweek, 11 Jan. 2025
Quarks are the particles in the standard model of particle physics that bind together and comprise particles like protons and neutrons.
—Robert Lea, Space.com, 21 Feb. 2025
Instead of fuel rods stuck in pressurized water as a neutron moderator and coolant, these reactors use nuclear fuel mixed with molten salt at normal atmospheric pressure.
—David Szondy, New Atlas, 20 Feb. 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 14 Mar. 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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