periodic acid periodic • periodical · · · Info · Definitions · Characters · · periodic acid · · Text Common · · Latin · · Scripts 13 · · Length 5 · · Syllables Definitions · · · (noun) any acid of iodine that contains oxygen. Synonyms: periodic acid. · · Noun Definition 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 e latin small letter e U+0065 i latin small letter i U+0069 o latin small letter o U+006F p latin small letter p U+0070 r latin small letter r U+0072