| Isonicotinic | a. (Chem.) (a) Pertaining to, or derived from, isonicotine. (b) Pertaining to, or designating, an acid isomeric with nicotinic acid. [ 1913 Webster ] |
| Nicotinic | a. (Chem.) Pertaining to, or derived from, nicotine; nicotic; -- used specifically to designate an acid related to pyridine, obtained by the oxidation of nicotine, and called nicotinic acid. [ 1913 Webster ] |
| nicotinic acid | 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. It is a cofactor in several enzymatic reactions, and is used to prevent a pellagra-like disease in dogs. [ MI11 ]
Syn. -- 3-pyridinecarboxylic acid, niacin, antipellagra vitamin. [ 1913 Webster +PJC ] |