A neutrino is 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 (Merriam-Webster dictionnary definition)
A neutrino is 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 (Merriam-Webster dictionnary definition)