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| neu·tri·no [ noo trnō ] (plural neu·tri·nos) |
noun |
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| Definition: |
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neutral elementary particle: a stable neutral elementary particle of the lepton group with a zero rest mass and no charge. There are three types of neutrinos, associated respectively with the electron, muon, and tau particle, and all have a spin of 1/2.
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| [Mid-20th century. <neutral + Italian -ino "small"] |
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