/ Dictionary / Index M mesomerism: Meaning and Definition of Find definitions for: me•som•er•ism Pronunciation: (mi-zom'u-riz"um, -som'-), [key] — n. Chem. resonance (def. 6). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mesomere mesometeorology Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language