/ Dictionary / Index M -mer: Meaning and Definition of Find definitions for: -mer Pronunciation: [key] a combining form meaning “member of a particular group”:Cf. isomer. mer. Pronunciation: [key] meridian. meridional. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: -mer (Thesaurus) Mequon merbromin Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language