neurotransmitter

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neurotransmitter

[noor-oh-trans-mit-er, -tranz-, nyoor-]
noun
any of several chemical substances, as epinephrine or acetylcholine, that transmit nerve impulses across a synapse to a postsynaptic element, as another nerve, muscle, or gland.

Origin:
1960–65; neuro- + transmitter

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Collins
World English Dictionary
neurotransmitter (ˌnjʊərəʊtrænzˈmɪtə)
 
n
a chemical by which a nerve cell communicates with another nerve cell or with a muscle

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

neurotransmitter neu·ro·trans·mit·ter (nur'ō-trāns'mĭt-ər, -trānz'-, nyur'-)
n.
Any of the various chemical substances, such as acetylcholine, that transmit nerve impulses across a synapse.

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
neurotransmitter   (nr'ō-trānz'mĭt-ər)  Pronunciation Key 
A chemical substance that is produced and secreted by a neuron and then diffuses across a synapse to cause excitation or inhibition of another neuron. Acetylcholine, norepinephrine, dopamine, and serotonin are examples of neurotransmitters.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

neurotransmitter definition


Any one of a number of chemicals that are used to transmit nerve signals across a synapse. They are sprayed from the end of the “upstream” nerve cell and absorbed by receptors in the “downstream” cell.

Note: Drugs like Prozac and alcohol affect the emission and reception of neurotransmitters.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
These electrical waves are stimulated originally by the arrival at a cell of a
  chemical called a neurotransmitter.
They release neurotransmitter only a small fraction of the time when their
  parent neuron fires an electrical impulse.
Most drugs that treat schizophrenia work by blocking receptors of the
  neurotransmitter dopamine.
Many antidepressants relieve depression by altering levels of the
  neurotransmitter serotonin in the brain.
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