fibrinogen fibrinocellular • fibrinogenetic · · · Info · Definitions · Synonyms · Characters · · fibrinogen · · Text Latin · · Script 10 · · Length 4 · · Syllables Definitions · · · (noun) a protein present in blood plasma; converts to fibrin when blood clots. Synonyms: factor I. · · Noun Definition 1 Synonyms · · · factor i · · Synonym 1 Characters · · b latin small letter b U+0062 e latin small letter e U+0065 f latin small letter f U+0066 g latin small letter g U+0067 i latin small letter i U+0069 n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072