neutrino

from Italian neutrino: Pauli thought that a neutral particle was necessarily required to respect the principle of energy conservation. He named this particle neutron. But Chadwick discovered the neutron in 1932. However, the discovered particle was too heavy to correspond to the particle imagined by Pauli, so Fermi proposed to rename the particle imagined by Pauli as neutrino, constructed on the root of neutron with the diminutive Italian suffix -ino (see plutino for a similar example).