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
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Because neutrinos can pass through almost any material, they could be used for communication through the Earth, reaching underground or underwater locations where conventional signals fail. Prabhat Ranjan Mishra, Interesting Engineering, 20 Apr. 2026 The neutrino is nearly as elusive as the W boson, but CMS can study muons very precisely. Clara Moskowitz, Scientific American, 10 Apr. 2026 Another possibility is that the anomalies — either individually or collectively — do point to neutrino mischief, but not mischief of the simplest variety, caused by a single electron-volt sterile neutrino. Quanta Magazine, 8 Apr. 2026 As gravity begins to collapse the star, and the core first forms a dense neutron star, the accompanying burst of neutrinos typically creates a powerful shock wave strong enough to rip apart the core and outer layers, leading to a supernova. ArsTechnica, 2 Mar. 2026 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

Browse Nearby Words

Cite this Entry

“Neutrino.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/neutrino. Accessed 27 Apr. 2026.

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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