Meaning of neutrino

neu•tri•no

Pronunciation: (n-trē'nō, ny-), [key]
— pl. -nos.
  1. any of the massless or nearly massless electrically neutral leptons. There is a distinct kind of neutrino associated with each of the massive leptons. Cf.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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