What is "antipellagra vitamin"

niacin \niacin\ n. A B vitamin (vitamin B5) essential for the normal function of the nervous system and the gastrointestinal tract. Called also nicotinic acid and antipellagra vitamin. Chemical formula C6H5NO2, chemically it is 3-pyridinecarboxylic acid.

Syn: nicotinic acid.

nicotinic acid \nic`o*tin"ic ac"id\, n. (Chem.) An organic acid ( C6H5NO2), a carboxylated derivative of pyridine, obtained by the oxidation of nicotine; called also niacin and antipellagra vitamin, and vitamin B5. Chemically it is 3-pyridinecarboxylic acid.

Note: It is a cofactor in several enzymatic reactions, and is used to prevent a pellagra-like disease in dogs.
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Syn: 3-pyridinecarboxylic acid, niacin, antipellagra vitamin.