norepinephrine

[nawr-ep-uh-nef-rin, -reen]
noun
1.
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.
2.
Pharmacology. a commercial form of this substance used for emergency treatment of lowered blood pressure.

Origin:
1940–45; nor- + epinephrine

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Collins
World English Dictionary
norepinephrine (ˌnɔːrɛpɪˈnɛfrɪn, -riːn)
 
n
the US name for noradrenaline

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

norepinephrine nor·ep·i·neph·rine (nôr'ěp-ə-něf'rĭn)
n.
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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American Heritage
Science Dictionary
norepinephrine   (nôr'ěp-ə-něf'rĭn)  Pronunciation Key 
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
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Example sentences
The drug inhibits a neurotransmitter called norepinephrine.
Thought to optimize levels of dopamine and norepinephrine, enhancing
  concentration and turning mundane tasks into wondrous ones.
Adrenergic receptors are receptors which bind the neurotransmitters epinephrine
  and norepinephrine.
These drugs target neurotransmitters other than or in addition to serotonin,
  such as norepinephrine.
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