horseradish peroxidase horse-radish • horseradish root · · · Info · Definitions · Characters · · horseradish peroxidase · · Text Common · · Latin · · Scripts 22 · · Length 8 · · Syllables Definitions · · · (noun) an enzyme used in immunohistochemistry to label antigens and their antibodies. Synonyms: horseradish peroxidase. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 d latin small letter d U+0064 e latin small letter e U+0065 h latin small letter h U+0068 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 s latin small letter s U+0073 x latin small letter x U+0078