nicotinic acid nicotinic • nicotinism · · · Info · Definitions · Synonyms · Characters · · nicotinic acid · · Text Common · · Latin · · Scripts 14 · · Length 6 · · Syllables Definitions · · · (noun) a B vitamin essential for the normal function of the nervous system and the gastrointestinal tract. Synonyms: niacin, nicotinic acid. · · Noun Definition 1 Synonyms · · · niacin · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 d latin small letter d U+0064 i latin small letter i U+0069 n latin small letter n U+006E o latin small letter o U+006F t latin small letter t U+0074