prothrombinase prothrombin accelerator • prothrombogen · · · Info · Definitions · Synonyms · Characters · · prothrombinase · · Text Latin · · Script 14 · · Length 4 · · Syllables Definitions · · · (noun) coagulation factor that is converted to an enzyme that converts prothrombin to thrombin in a reaction that depends on calcium ions and other coagulation factors. Synonyms: factor X. · · Noun Definition 1 Synonyms · · · factor x · · Synonym 1 Characters · · a latin small letter a U+0061 b latin small letter b U+0062 e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 m latin small letter m U+006D n latin small letter n U+006E 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 t latin small letter t U+0074