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Definition of Isonicotinic acid
1. Noun. (organic compound) An isomer of nicotinic acid, ''pyridine-4-carboxylic acid'' ¹
¹ Source: wiktionary.com
Medical Definition of Isonicotinic acid
1. 4-Pyridinecarboxylic acid;its hydrazide is isoniazid. (05 Mar 2000)