neutrino

noun

neu·​tri·​no nü-ˈtrē-(ˌ)nō How to pronounce neutrino (audio)
nyü-
plural neutrinos
: an uncharged elementary particle that is believed to have a very small mass, that has any of three forms, and that interacts only rarely with other particles
neutrinoless adjective

Examples of neutrino in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
According to the Standard Model of particle physics, neutrinos are thought to interact solely through the weak nuclear force, which makes their properties notoriously hard to measure. Georgina Jedikovska, Interesting Engineering, 8 Oct. 2025 Croker and Tarlè say the dark-energy-making black holes enable a plump neutrino mass. Rebecca Boyle, Scientific American, 4 Oct. 2025 The idea that neutrinos were flying through me every second blew my mind. Adam Frank, Big Think, 25 Sep. 2025 That's because baryons would have disappeared since the Big Bang, as they are converted to dark energy droplets, thus allowing neutrinos to make a contribution in line with measurements of their abundance. Robert Lea, Space.com, 24 Aug. 2025 See All Example Sentences for neutrino

Word History

Etymology

Italian, from neutro neutral, neuter, from Latin neutr-, neuter

First Known Use

1934, in the meaning defined above

Time Traveler
The first known use of neutrino was in 1934

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Cite this Entry

“Neutrino.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/neutrino. Accessed 15 Oct. 2025.

Kids Definition

neutrino

noun
neu·​tri·​no n(y)ü-ˈtrē-nō How to pronounce neutrino (audio)
plural neutrinos
: an uncharged elementary particle believed to have little or no mass

Medical Definition

neutrino

noun
neu·​tri·​no n(y)ü-ˈtrē-(ˌ)nō How to pronounce neutrino (audio)
plural neutrinos
: an uncharged elementary particle that is believed to be massless or to have a very small mass, that has any of three forms, and that interacts only rarely with other particles

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