serum sickness serum jaundice • serum therapy · · · Info · Definitions · Synonyms · Characters · · serum sickness · · Text Common · · Latin · · Scripts 14 · · Length 4 · · Syllables Definitions · · · (noun) a delayed allergic reaction to the injection of an antiserum caused by an antibody reaction to an antigen in the donor serum. Synonyms: serum sickness, serum disease. · · Noun Definition 1 Synonyms · · · serum disease · · Synonym 1 Characters · · space U+0020 c latin small letter c U+0063 e latin small letter e U+0065 i latin small letter i U+0069 k latin small letter k U+006B m latin small letter m U+006D n latin small letter n U+006E r latin small letter r U+0072 s latin small letter s U+0073 u latin small letter u U+0075