Etymology
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neutrino (n.)

"neutral particle smaller than a neutron," 1934, from Italian neutrino, coined 1933 by Italian physicist Enrico Fermi from neutro "neuter" (see neuter (adj.)) + -ino, diminutive suffix.

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Definitions of neutrino

neutrino (n.)
an elementary, electrically neutral particle with a very small mass;
From wordnet.princeton.edu