noun Biochemistry.

  1. a colorless, crystalline, water-soluble solid, C6H6N2O, the amide of nicotinic acid, and a component of the vitamin-B complex, found in meat, liver, fish, whole wheat, and eggs: used in medicine chiefly as an agent for preventing or treating human pellagra or animal black tongue.


  1. the amide of nicotinic acid: a component of the vitamin B complex and essential in the diet for the prevention of pellagra. Formula: C 6 H 6 ON 2


  1. The biologically active amide of niacin having similar vitamin activity and used in the prevention and treatment of pellagra.niacinamide
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