/ Dictionary / Index M merbromin: Meaning and Definition of Find definitions for: mer•bro•min Pronunciation: (mur-brō'min), [key] — n. Pharm. an iridescent green, water-soluble powder, CHBrHgNaO, that forms a red solution when dissolved in water: used as an antiseptic and as a germicide. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. -mer merc Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language