Breadcrumb Home > Thesaurus > P Synonyms of pion Find synonyms for: Noun1. pion, pi-meson, meson, mesotronusage: a meson involved in holding the nucleus together; produced as the result of high-energy particle collisionWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of pion (Dictionary) ✖ Related Content Daily Word Quiz: sepulture Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language