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neu•tri•no



Pronunciation: (nOO-trē'nō, nyOO-), [key]
n.,
pl. -nos.
Physics.
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. antineutrino, lepton, conservation of lepton number.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

neutral zoneneutrino astronomy
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