Definition of choline
: a basic compound C5H14NO that is found in various foods (such as egg yolks and legumes) or is synthesized in the liver, that is a component of lecithin and a precursor of acetylcholine, and that is essential to the metabolism of fat in the liver and is usually included in the vitamin B complex
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Merriam-Webster unabridged
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Time Traveler for choline
The first known use of choline was circa 1871
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