/ Dictionary / Index E edrophonium: Meaning and Definition of Find definitions for: ed•ro•pho•ni•um Pronunciation: (ed"ru-fō'nē-um), [key] — n. Pharm. a substance, CHBrNO, used to reverse certain muscle-relaxing agents, such as tubocurarine, in surgical procedures: also used in the diagnosis of myasthenia gravis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. EDP eds. Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language