antinucleon: Meaning and Definition of

an•ti•nu•cle•on

Pronunciation: (an"tē-n'klē-on", -ny'-, an"tī-), [key]
— n. Physics.
  1. an antiproton or an antineutron.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.