serum sertum • serumal · · · Info · Definitions · Synonyms · Characters · · serum · · Text Latin · · Script 5 · · Length 2 · · Syllables Definitions · · · (noun) an amber, watery fluid, rich in proteins, that separates out when blood coagulates. Synonyms: blood serum. · · Noun Definition 1 Synonyms · · · blood serum · · Synonym 1 Characters · · e latin small letter e U+0065 m latin small letter m U+006D r latin small letter r U+0072 s latin small letter s U+0073 u latin small letter u U+0075