Definition of "antilepton" []

• The antiparticle of a lepton. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "It decays, nearly instantly, into the heaviest quark-antiquark or lepton-antilepton pair it can."
• "Sorry couldnt write symbol for 1st generation antilepton. but my question is, in the above radioactive decay what would be the unknown isotope."