ephedrine

[ih-fed-rin, ef-i-dreen, -drin]
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:
1885–90; < Neo-Latin Ephedr(a) ephedra + -ine2

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ephedrine or ephedrin (ɪˈfɛdrɪn, ˈɛfɪˌdriːn, -drɪn, ɪˈfɛdrɪn, ˈɛfɪˌdriːn, -drɪn)
 
n
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
 
[C19: from New Latin ephedra + -ine²]
 
ephedrin or ephedrin
 
n
 
[C19: from New Latin ephedra + -ine²]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

ephedrine
named 1887 by Japanese organic chemist Nagai Nagayoshi (1844-1929), from the plant ephedra, from which it was first extracted.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

ephedrine e·phed·rine (ĭ-fěd'rĭn, ěf'ĭ-drēn')
n.
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.
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American Heritage
Science Dictionary
ephedrine   (ĭ-fěd'rĭn, ěf'ĭ-drēn')  Pronunciation Key 
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.
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Encyclopedia Britannica
Encyclopedia

ephedrine

alkaloid used as a decongestant drug. It is obtainable from plants of the genus Ephedra, particularly the Chinese species E. sinica, and it has been used in China for more than 5,000 years to treat asthma and hay fever. It is effective when administered orally, and its effects persist for several hours, in contrast to the shorter-acting norepinephrine. Since the 1920s synthetic ephedrine has been used in Western medicine as a bronchodilator and nasal decongestant and in controlling urinary incontinence. When its longer duration of action is desirable, ephedrine replaces epinephrine in nonemergency treatment of allergic reactions. Its slow action renders it useless in arresting acute allergic attacks. Because of its stimulant effects, ephedrine must sometimes be used in combination with sedatives.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Several contain ephedrine, the active ingredient in a widely advertised over-the-counter asthma remedy.
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