fermion Hear it!

fermion definition

fer·mion (fer′mē än′, fʉr′-)

noun

Particle Physics any of a class of subatomic particles that obey the Pauli exclusion principle and have fractional spin, including the leptons, quarks, and baryons

Etymology: after Enrico Fermi + -on

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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