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[koh-leen, kol-een] /ˈkoʊ lin, ˈkɒl in/
Biochemistry. a quaternary ammonium cation, C 5 H 14 N + O, one of the B-complex vitamins, found in the lecithin of many plants and animals.
choline hydroxide, C 5 H 15 NO 2 , the viscous, strongly alkaline commercial form of this compound, usually synthesized, used as a feed supplement, especially for poultry, and in medicine in certain liver conditions.
choline chloride, C 5 H 14 ClNO.
Origin of choline
1855-60; chol- + -ine2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for choline
  • The choline nicotine lithium connection is somehow involved in the addiction.
  • It contains choline and inositol, two compounds that are important for the breakdown of fat and cholesterol.
  • The fetal origins of memory: the role of dietary choline in optimal brain development.
  • choline is a necessary source of methyl groups for methyl group transfer.
British Dictionary definitions for choline


/ˈkəʊliːn; -ɪn; ˈkɒl-/
a colourless viscous soluble alkaline substance present in animal tissues, esp as a constituent of lecithin: used as a supplement to the diet of poultry and in medicine for preventing the accumulation of fat in the liver. Formula:[(CH3)3NCH2CH2OH]+OH
Word Origin
C19: from chole- + -ine², so called because of its action in the liver
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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choline in Medicine

choline cho·line (kō'lēn')
A natural amine often classed in the vitamin B complex and a constituent of many other biologically important molecules, such as acetylcholine and lecithin.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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choline in Science
A natural amine often classed in the vitamin B complex. It is incorporated into the structure of many other biologically important molecules, such as acetylcholine and lecithin. Chemical formula: C5H15NO2.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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