Definitions

from The American HeritageĀ® Dictionary of the English Language, 4th Edition

  • n. Any of three electrically neutral subatomic particles in the lepton family. See Table at subatomic particle.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An elementary particle that is classified as a lepton, and has an extremely small but nonzero mass and no electric charge. It interacts with the surroundings only via the weak force or gravitation, making it very difficult to detect.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an elementary particle with zero charge and zero mass

Etymologies

Italian, from neutro, neuter, from Latin neuter, neutr-; see neuter.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Italian neutrino (coined by Enrico Fermi), diminutive of neutroĀ ("neutral"). (Wiktionary)

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