dopamine

[doh-puh-meen]
noun
1.
Biochemistry. a catecholamine neurotransmitter in the central nervous system, retina, and sympathetic ganglia, acting within the brain to help regulate movement and emotion: its depletion may cause Parkinson's disease. Compare dopa.
2.
Pharmacology. a dopamine preparation used to increase the force of contraction of the heart in the treatment of shock.
Compare levodopa.


Origin:
1955–60; see dopa, amine

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World English Dictionary
dopamine (ˈdɒpəmɪn)
 
n
a chemical found in the brain that acts as a neurotransmitter and is an intermediate compound in the synthesis of noradrenaline. Formula: (HO)2C6H3(CH2)2NH2
 
[from d(ihydr)o(xy)p(henylethyl)amine]

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Etymonline
Word Origin & History

dopamine
1959, from DOPA, the amino acid (from first letter of elements of dioxyphenylalanine), + -amine.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

dopamine do·pa·mine (dō'pə-mēn')
n.
A monoamine neurotransmitter formed in the brain by the decarboxylation of dopa and essential to the normal functioning of the central nervous system. A reduction in its concentration within the brain is associated with Parkinson's disease. Also called 3-hydroxytyramine.

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
dopamine   (dō'pə-mēn')  Pronunciation Key 
A monoamine neurotransmitter that is formed during the synthesis of norepinephrine and is essential to the normal functioning of the central nervous system. A reduction of dopamine in the brain is associated with the development of Parkinson's disease. Chemical formula: C8H11NO2.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Exercise increases serotonin and dopamine production in the brain.
Dopamine has been implicated in other addiction studies.
Thought to optimize levels of dopamine and norepinephrine, enhancing
  concentration and turning mundane tasks into wondrous ones.
Earlier research showed that nicotine stimulates the release of the
  neurotransmitter molecule dopamine in the brain.
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