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SYN: nicotinic acid.
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ni·a·cin 'nī-ə-sən n a crystalline acid C6H5NO2 that is a member of the vitamin B complex occurring usu. in the form of a complex of niacinamide in various animal and plant parts (as blood, liver, yeast, bran, and legumes) and is effective in preventing and treating human pellagra and blacktongue of dogs called also nicotinic acid
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n.
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ni·a·cin (niґə-sin) nicotinic acid, a member of the vitamin B complex that is a constituent of the redox coenzymes nicotinamide adenine dinucleotide (NAD) and nicotinamide adenine dinucleotide phosphate (NADP). [USP] a preparation of niacin, used in the prophylaxis and treatment of niacin deficiency and the treatment of hyperlipidemia; administered orally, intramuscularly, or intravenously.Medical dictionary. 2011.