/ Dictionary / Index M meson: Meaning and Definition of Find definitions for: me•son Pronunciation: (mē'zon, -son, mez'on, mes'-), [key] — n. any hadron, or strongly interacting particle, other than a baryon. Mesons are bosons, having spins of 0, 1, 2, …, and, unlike baryons, do not obey a conservation law. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: meson (Thesaurus) mesomorphic mesonephros Related Content Daily Word Quiz: placid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language