: 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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Beyond electrons, the quarks that make up protons and neutrons in atomic nuclei are also fermions.
—
Matt Von Hippel, Quanta Magazine, 23 June 2025
An atom consists of a heavy center, called the nucleus, made of particles called protons and neutrons.
—Stephen L. Levy, The Conversation, 23 June 2025
This not only means dark matter is effectively invisible, but also that it can't be composed of particles like electrons, protons, and neutrons that make up the atoms that compose everyday matter like stars, planets, moons, and the cat next door.
—Robert Lea, Space.com, 17 June 2025
But the rest of the universe is made of cosmic baryons, or ordinary matter, which can be found in tiny particles called protons and neutrons.
—Ashley Strickland, CNN Money, 16 June 2025
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Matt Von Hippel, Quanta Magazine, 23 June 2025
An atom consists of a heavy center, called the nucleus, made of particles called protons and neutrons.
—Stephen L. Levy, The Conversation, 23 June 2025
This not only means dark matter is effectively invisible, but also that it can't be composed of particles like electrons, protons, and neutrons that make up the atoms that compose everyday matter like stars, planets, moons, and the cat next door.
—Robert Lea, Space.com, 17 June 2025
But the rest of the universe is made of cosmic baryons, or ordinary matter, which can be found in tiny particles called protons and neutrons.
—Ashley Strickland, CNN Money, 16 June 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 19 Jul. 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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