a stable leptonic neutral elementary particle with very small or possibly zero rest mass and spin 1⁄2 that travels at the speed of light. Three types exist, associated with the electron, the muon, and the tau particle
Word origin
C20: from Italian, diminutive of neutroneneutron
neutrino in American English
(nuˈtrinoʊ; njutrinoʊ)
nounWord forms: pluralneuˈtrinos
Particle Physics
any of three stable leptons having a mass approaching zero and no charge: a neutrino has almost no interaction with matter