factor xiii factor xii • factory · · · Info · Definitions · Synonyms · Characters · · factor xiii · · Text Common · · Latin · · Scripts 11 · · Length 5 · · Syllables Definitions · · · (noun) in the clotting of blood thrombin catalyzes factor XIII into its active form (fibrinase) which causes fibrin to form a stable clot. Synonyms: fibrinase, factor XIII. · · Noun Definition 1 Synonyms · · · fibrinase · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 f latin small letter f U+0066 i latin small letter i U+0069 o latin small letter o U+006F r latin small letter r U+0072 t latin small letter t U+0074 x latin small letter x U+0078