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Related to tau lepton: muon
The flavor of lepton that belongs to the third generation of elementary fermions and has a negative electric charge, a mass 3.477 times that of an electron, and a mean lifetime of about 2.9 × 10-13 second. Also called tauon.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.