factor ix factor iv • factor of proportionality · · · Info · Definitions · Characters · · factor ix · · Text Common · · Latin · · Scripts 9 · · Length 3 · · Syllables Definitions · · · (noun) coagulation factor whose absence is associated with hemophilia B. Synonyms: Christmas factor, factor IX. · · Noun Definition 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