serotonin

[ser-uh-toh-nin, seer-]
noun Biochemistry.
a neurotransmitter, derived from tryptophan, that is involved in sleep, depression, memory, and other neurological processes.

Origin:
1945–50; sero- + tone + -in2

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World English Dictionary
serotonin (ˌsɛrəˈtəʊnɪn)
 
n
a compound that occurs in the brain, intestines, and blood platelets and acts as a neurotransmitter, as well as inducing vasoconstriction and contraction of smooth muscle; 5-hydroxytryptamine (5HT)
 
[from sero- + ton(ic) + -in]

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Etymonline
Word Origin & History

serotonin
neurotransmitting chemical, 1948, coined from sero-, comb. form of serum (q.v.) + ton(ic) + chemical suffix -in.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

serotonin se·ro·to·nin (sěr'ə-tō'nĭn, sēr'-)
n.
An organic compound formed from tryptophan and found in animal and human tissue, especially the brain, blood serum, and gastric mucous membranes, and active in vasoconstriction, stimulation of the smooth muscles, transmission of impulses between nerve cells, and regulation of cyclic body processes. Also called 5-hydroxytryptamine.

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
serotonin   (sěr'ə-tō'nĭn, sîr'-)  Pronunciation Key 
A monoamine substance that is formed from tryptophan and found in many animal tissues, including the intestine and central nervous system. In the brain, serotonin acts as a neurotransmitter that is involved in the control of pain perception, the sleep-wake cycle, and mood. Serotonin is also produced in some bacteria and plants.
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.
Serotonin is another neurotransmitter that is usually deficient in an addicted
  brain.
Those larger ones are activated by a neurochemical called serotonin.
However, serotonin and pain thresholds have been linked.
Image for serotonin
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