/ Dictionary / Index M mesotron: Meaning and Definition of Find definitions for: mes•o•tron Pronunciation: (mez'u-tron", mes'-, mē'zu-, -su-), [key] — n. Physics. (no longer in technical use) meson. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mesotron (Thesaurus) mesothorax mesovarium Related Content Daily Word Quiz: nonchalant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language