Try Our Apps


Avoid these words. Seriously.


[ih-fed-rin, ef-i-dreen, -drin] /ɪˈfɛd rɪn, ˈɛf ɪˌdrin, -drɪn/
noun, Pharmacology.
a white, crystalline alkaloid, C 10 H 15 N, 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 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
Cite This Source
Examples from the Web for ephedrine
Historical Examples
  • Combination of ephedrine and homatropine hydrochlorates (100:1).

    Merck's 1899 Manual Merck & Co.
British Dictionary definitions for ephedrine


/ɪˈfɛdrɪn; ˈɛfɪˌdriːn; -drɪn/
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: C6H5CH(OH)CH(NHCH3)CH3
Word Origin
C19: from New Latin ephedra + -ine²
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
Cite This Source
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
Cite This Source
ephedrine in Medicine

ephedrine e·phed·rine (ĭ-fěd'rĭn, ěf'ĭ-drēn')
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.
Cite This Source
ephedrine in Science
  (ĭ-fěd'rĭn, ěf'ĭ-drēn')   
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 © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source

Word of the Day

Nearby words for ephedrine

Difficulty index for ephedrine

Few English speakers likely know this word

Word Value for ephedrine

Scrabble Words With Friends