neutrino

neu·tri·no   (nōō-trē'nō, nyōō-)    n.   pl. neu·tri·nos Any of three electrically neutral subatomic particles in the lepton family. See Table at subatomic particle. [Italian, from neutro, neuter, from Latin neuter, neutr-; see neuter.]

neutrino [(nooh-tree-noh)]

An electrically neutral particle that is often emitted in the process of radioactive decay of nuclei. Neutrinos are difficult to detect, and their existence was postulated twenty years before the first one was actually discovered in the laboratory. Millions of neutrinos produced by nuclear reactions in the sun pass through your body every second without disturbing any atoms.

neutrino 

Main Entry: neu·tri·no
Pronunciation: n(y)ü-'trE-(")nO
Function: noun
Inflected Form: plural -nos
: an unchargedelementary particle that is believed to be massless or to have a very small mass, that has any of three forms, and that interacts only rarely with other particles

neutrino neu·tri·no (n&oomacr;-trē'nō, ny&oomacr;-)
n. pl. neu·tri·nos
Any of three electrically neutral subatomic particles in the lepton family.