factor iii factor ii • factor in · · · Info · Definitions · Synonyms · Characters · · factor iii · · Text Common · · Latin · · Scripts 10 · · Length 5 · · Syllables Definitions · · · (noun) an enzyme liberated from blood platelets that converts prothrombin into thrombin as blood starts to clot. Synonyms: thromboplastin, thrombokinase, factor III. · · Noun Definition 1 Synonyms · · · thromboplastin · · Synonym 1 thrombokinase · · Synonym 2 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