Neutrino/Definition

A stable fundamental subatomic particle of matter (no internal structure) classified as a lepton; for electron-associated neutrinos evidence pointing to a finite mass less than an electron, lacking electrical charge, extremely non-interacting with matter; evident in three flavors (varieties or types): electron neutrinos, muon neutrinos, and tau neutrinos, each with a charged partner, the electron, the muon, and the tau, respectively.