[ih-fed-rin, ef-i-dreen, -drin]
noun Pharmacology.
  1. a white, crystalline alkaloid, C10H15N, obtained from a species of Ephedra or synthesized: used in medicine chiefly for the treatment of asthma, hay fever, and colds.

Origin of ephedrine

1885–90; < New Latin Ephedr(a) ephedra + -ine2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for ephedrine

Historical Examples of ephedrine

  • Combination of ephedrine and homatropine hydrochlorates (100:1).

    Merck's 1899 Manual

    Merck &amp; Co.

British Dictionary definitions for ephedrine



  1. a white crystalline alkaloid obtained from plants of the genus Ephedra: used for the treatment of asthma and hay fever; l-phenyl-2-methylaminopropanol. Formula: C 6 H 5 CH(OH)CH(NHCH 3)CH 3

Word Origin for ephedrine

C19: from New Latin ephedra + -ine ²
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for ephedrine

1889, named 1887 by Japanese organic chemist Nagai Nagayoshi (1844-1929), from the plant ephedra, from which it was first extracted, + chemical suffix -ine (2).

Online Etymology Dictionary, © 2010 Douglas Harper

ephedrine in Medicine


[ĭ-fĕdrĭn, ĕfĭ-drēn′]
  1. An odorless crystalline or powdered alkaloid isolated from shrubs of the genus Ephedra or made synthetically and used in the treatment of allergies and asthma.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

ephedrine in Science


[ĭ-fĕdrĭn, ĕfĭ-drēn′]
  1. A white, odorless, powdered or crystalline alkaloid isolated from shrubs of the genus Ephedra or made synthetically. It is used in the treatment of allergies and asthma. Chemical formula: C10H15NO.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.