/ Dictionary / Index E ephedrine: Meaning and Definition of Find definitions for: e•phed•rine Pronunciation: (i-fed'rin, ef'i-drēn", -drin), [key] — n. Pharm. a white, crystalline alkaloid, CHN, obtained from a species of Ephedra or synthesized: used in medicine chiefly for the treatment of asthma, hay fever, and colds. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ephedrine (Thesaurus) ephedra ephemera Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language