xanthine xanthin • xanthinuria · · · Info · Definitions · Characters · · xanthine · · Text Latin · · Script 8 · · Length Definitions · · · (noun) crystalline oxidation product of the metabolism of nucleoproteins; precursor of uric acid; found in many organs and in urine. · · Noun Definition 1 Characters · · a latin small letter a U+0061 e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 n latin small letter n U+006E t latin small letter t U+0074 x latin small letter x U+0078