a·ce·tyl·cho·line

[uh-seet-l-koh-leen, uh-set-, as-i-tl-]
noun
1.
Biochemistry. the acetic acid ester of choline, C 7 H 17 NO 3 , released and hydrolyzed during nerve conduction and causing muscle action by transmitting nerve impulses across synapses.
2.
Pharmacology. this substance used in its chloride form in eye surgery. Abbreviation: ACh

Origin:
1905–10; acetyl + choline

a·ce·tyl·cho·lin·ic [uh-seet-l-koh-lin-ik, uh-set-, as-i-tl-] , adjective
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
acetylcholine (ˌæsɪtaɪlˈkəʊliːn, -lɪn) [Click for IPA pronunciation guide]
 
n
a chemical substance secreted at the ends of many nerve fibres, esp in the autonomic nervous system, and responsible for the transmission of nervous impulses. Formula: CH3CO2(CH2)2N (CH3)3+

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Acetylcholine is always a great word to know.
So is selenium. Does it mean:
Symbol: Se; atomic weight: 78.96; atomic number: 34
Symbol: Pt; atomic weight: 195.09; atomic number: 78
American Heritage
Medical Dictionary

acetylcholine a·ce·tyl·cho·line (ə-sēt'l-kō'lēn')
n.
Abbr. Ach
A white crystalline derivative of choline that is released at the ends of nerve fibers in the somatic and parasympathetic nervous systems and is involved in the transmission of nerve impulses in the body.

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
acetylcholine   (ə-sēt'l-kō'lēn')  Pronunciation Key 
A substance that is released at the junction between neurons and skeletal muscle fibers, at the nerve endings of the parasympathetic nervous system, and across synapses in the central nervous system, where it acts as a neurotransmitter. Chemical formula: C7H16NO2.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Acetylcholine is a neurotransmitter that is important for learning and memory.
One obvious suspect is the receptor for the brain chemical acetylcholine, which
  happens to respond strongly to nicotine as well.
More specialised cells use dopamine, serotonin, acetylcholine and a variety of
  other molecules.
Lambert-Eaton syndrome occurs when nerves cells do not release enough of a
  chemical called acetylcholine.
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