Found in the following dictionaries
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OTCWL2014 (NASPA Word List 2014)
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SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Niacin" Definition
noun
A white crystalline acid, C5H4NCOOH, that is a component of the vitamin B complex found in meat, wheat germ, dairy products, and yeast and is used to treat and prevent pellagra. Also called nicotinic acid.
Source: American Heritage Dictionary
An acid CHNO of the vitamin B complex found widely in animals and plants and used especially against pellagra.
Source: Merriam-Webster
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