Definition of neutron
: 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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Recent Examples of neutron from the Web
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But there’s much more—protons and neutrons are made up of quarks held together by gluons, one of several types of boson.
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The result was highly efficient fusion, 500 times better neutron generation per unit of laser energy.
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Of GUTs’ predictions, only the proton and neutron decay being sought by Super-Kamiokande seems testable.
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One second after the Big Bang, the temperature had fallen to about a trillion degrees Fahrenheit, and protons and neutrons appeared on the scene.
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Uranium has two isotopes, 235U and 238U, that differ by three in the number of neutrons in their nuclei.
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One of the most convincing signs of life embedded in the martian rock could be an imbalance of naturally occurring isotopes, or variations of the same element with differing numbers of neutrons.
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On board the spacecraft is an instrument that detects neutrons and highly energetic light called gamma rays coming from the surface of Ceres.
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All the particles, like protons, neutrons, and electrons, were created in the first few moment of the universe.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'neutron.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Origin and Etymology of neutron
probably from neutral
NEUTRON Defined for English Language Learners
Definition of neutron for English Language Learners
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physics : a very small particle of matter that has no electrical charge and is part of the nucleus of all atoms except hydrogen atoms
NEUTRON Defined for Kids
Definition of neutron for Students
: a particle that has a mass nearly equal to that of the proton but no electrical charge and that is present in all atomic nuclei except those of hydrogen
Medical Dictionary
medical Definition of neutron
: 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
Learn More about neutron
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See words that rhyme with neutron Spanish Central: Translation of neutron Nglish: Translation of neutron for Spanish speakers Britannica.com: Encyclopedia article about neutron
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