: 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 experiments were conducted at ORNL’s Spallation Neutron Source, where scientists used advanced neutron-scattering techniques to observe both the atomic structure and the motion of atoms inside the material.
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Prabhat Ranjan Mishra, Interesting Engineering, 9 Mar. 2026
Water is replaced with liquid sodium coolant, which melts at around 1,616 °F (880 °C) and is transparent to neutrons.
—David Szondy
march 08, New Atlas, 8 Mar. 2026
The proton was isolated in 1920, followed by the neutron in 1932.
—Big Think, 23 Feb. 2026
In the new work, Milton and her colleagues examined the ratio of different isotopes—forms of atoms with differing numbers of uncharged neutrons in their nucleus—of carbon, nitrogen and sulfur in maize cobs archaeologists had uncovered from the Chincha Valley.
—Meghan Bartels, Scientific American, 11 Feb. 2026
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Prabhat Ranjan Mishra, Interesting Engineering, 9 Mar. 2026
Water is replaced with liquid sodium coolant, which melts at around 1,616 °F (880 °C) and is transparent to neutrons.
—David Szondy
march 08, New Atlas, 8 Mar. 2026
The proton was isolated in 1920, followed by the neutron in 1932.
—Big Think, 23 Feb. 2026
In the new work, Milton and her colleagues examined the ratio of different isotopes—forms of atoms with differing numbers of uncharged neutrons in their nucleus—of carbon, nitrogen and sulfur in maize cobs archaeologists had uncovered from the Chincha Valley.
—Meghan Bartels, Scientific American, 11 Feb. 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 12 Mar. 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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