/ Dictionary / Index M metamerism: Meaning and Definition of Find definitions for: me•tam•er•ism Pronunciation: (mu-tam'u-riz"um), [key] — n. division into metameres, the developmental process of somite formation. existence in a metameric state. isomerism resulting from the attachment of different groups to the same atom, as CHNHCH and CHNHCH. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. metameric metamorphic Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language