Definition of neutrino noun from the Oxford Advanced Learner's Dictionary



BrE BrE//njuːˈtriːnəʊ//
; NAmE NAmE//nuːˈtriːnoʊ//
(pl. neutrinos)(physics)
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an extremely small particle that has no electrical charge, and which rarely reacts with other matter Word Origin 1930s: from Italian, diminutive of neutro ‘neutral’.
See the Oxford Advanced American Dictionary entry: neutrino