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[nawr-ep-uh-nef-rin, -reen] /ˌnɔr ɛp əˈnɛf rɪn, -rin/
Also called noradrenaline. Physiology. a neurotransmitter, released by adrenergic nerve terminals in the autonomic and possibly the central nervous system, that has such effects as constricting blood vessels, raising blood pressure, and dilating bronchi.
Pharmacology. a commercial form of this substance used for emergency treatment of lowered blood pressure.
Origin of norepinephrine
First recorded in 1940-45; nor- + epinephrine Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for norepinephrine


/ˌnɔːrɛpɪˈnɛfrɪn; -riːn/
the US name for noradrenaline
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
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Word Origin and History for norepinephrine

1868, from normal (in reference to molecular structure) + epinephrine.

Online Etymology Dictionary, © 2010 Douglas Harper
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norepinephrine in Medicine

norepinephrine nor·ep·i·neph·rine (nôr'ěp-ə-něf'rĭn)
A substance, both a hormone and neurotransmitter, secreted by the adrenal medulla and the nerve endings of the sympathetic nervous system to cause vasoconstriction and increases in heart rate, blood pressure, and the sugar level of the blood. Also called levarterenol, noradrenalin.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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norepinephrine in Science
A substance that acts both as a neurotransmitter and hormone, secreted in the central nervous system, at the nerve endings of the sympathetic nervous system, and by the adrenal gland. Norepinephrine is similar to epinephrine in its physiological effects but acts to regulate regular physiologic activity rather than being released in response to stress. Also called noradrenaline. Chemical formula: C8H11NO3.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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