
1) Constituent of lecithin 2) Vitamin b 3) Vitamin b complex 
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 Choline is a water-soluble essential nutrient. It is usually grouped within the B-complex vitamins. Choline generally refers to the various quaternary ammonium salts containing the N,N,N-trimethylethanolammonium cation. (X− on the right denotes an undefined counteranion). The cation appears in the head groups of phosphatidylcholine and sphingomy...
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http://en.wikipedia.org/wiki/Choline

• (n.) See Neurine.
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a nitrogen-containing alcohol related to the vitamins in activity. It is apparently an essential nutrient for a number of microorganisms and higher ... [5 related articles]
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A nutrient in the vitamin B complex that the body needs in small amounts to function and stay healthy. Choline helps cells make membranes, make a neurotransmitter (a chemical that helps nerve cells communicate with other cells), and remove fat from the liver. It is found in whole milk, beef liver, eggs, soy foods, and peanuts. Choline is water-solu...
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<biochemistry> Esterified in the head group of phospholipids (phosphatidylcholine and sphingomyelin) and in the neurotransmitter acetylcholine. Otherwise a biological source of methyl groups. ... (18 Nov 1997) ... 
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(ko´lēn) an amine that occurs in phosphatidylcholine and acetylcholine, and is an important methyl donor in intermediary metabolism. It is a lipotropic agent, decreasing liver fat content by increasing phospholipid turnover. It was formerly considered to be part of the vitamin B complex, but is now classified as a pseudo...
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A naturally occurring substance which is a precursor of acetylcholine.
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Esterified in the head group of phospholipids (phosphatidyl choline and sphingomyelin) and in the neurotransmitter acetylcholine. Otherwise a biological source of methyl groups.
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Cho'line  noun [ Greek ... bile.] 
 (Physiol. Chem.) See 
 Neurine . 
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Type: Term Pronunciation: kō′lēn Definitions: 1. agent found in most animal tissues either free or in combination as lecithin (phosphatidylcholine), acetate (acetylcholine), or cytidine diphosphate (cytidine diphosphocholine). It is included in the vitamin B complex. Several salts of choline are used in medicine. Synonyms: lipotropi...
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A natural substance that is classified as a B-Vitamin. Getting adequate amounts of choline during pregnancy is important for fetal brain development and decreases the risk for neural tube defects. Choline plays a significant role in both male and female fertility. It is recommended that pregnant women consume 450 milligrams of choline each day, ......
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A B vitamin important for proper function of the nervous system and for preventing fat deposition in the liver.
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[
n] - a B-complex vitamin that is a constituent of lecithin
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 noun a B-complex vitamin that is a constituent of lecithin; essential in the metabolism of fat
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A brain transmitter that allows cells to communicate with each other.
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a quaternary ammonium cation, CHN⫀O, one of the B-complex vitamins, found in the lecithin of many plants and animals. · choline hydroxide, CHNO, the viscous, strongly alkaline commercial form of this compound, usually synthesized, used as a feed supplement, esp. for poultry, and in medicine in certain liver conditions. · choline chlo...
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