: 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 13-foot-tall, 13-foot-wide (four-meter) cylinder uses ultra-pure lead to block gamma rays and high-density polyethylene to absorb neutrons.
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Georgina Jedikovska, Interesting Engineering, 18 Mar. 2026
Northwestern and Fermilab are leading an experiment to determine how detectors respond to interactions with known particles — specifically neutrons from a neutron beam — to simulate how the detectors might interact with dark matter particles in the SuperCDMS.
—Adam Harrington, CBS News, 17 Mar. 2026
The gravitational pressure could be so extreme as to crush neutrons into their building blocks, which are fundamental particles called quarks and the gluons that ordinarily bind quarks together to form protons and neutrons.
—Keith Cooper, Space.com, 15 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
See All Example Sentences for neutron
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Georgina Jedikovska, Interesting Engineering, 18 Mar. 2026
Northwestern and Fermilab are leading an experiment to determine how detectors respond to interactions with known particles — specifically neutrons from a neutron beam — to simulate how the detectors might interact with dark matter particles in the SuperCDMS.
—Adam Harrington, CBS News, 17 Mar. 2026
The gravitational pressure could be so extreme as to crush neutrons into their building blocks, which are fundamental particles called quarks and the gluons that ordinarily bind quarks together to form protons and neutrons.
—Keith Cooper, Space.com, 15 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
See All Example Sentences for neutron
Cite this Entry
“Neutron.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/neutron. Accessed 30 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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