factor i(n = noun.substance) fibrinogen - a protein present in blood plasma; converts to fibrin when blood clots;
is a kind of clotting factor, coagulation factor

absorption factor, accelerator factor, alexander i, angiotensin i, antiberiberi factor, antihaemophilic factor, antihemophilic factor, antihemorrhagic factor, antiophthalmic factor, antipernicious anemia factor, antonio gaudi i cornet, artaxerxes i, bosna i hercegovina, catherine i, causal factor, charles i, christmas factor, claudius i, clotting factor, clovis i, coagulation factor, cognitive factor, common factor, constantine i, conversion factor, czar alexander i, czar nicholas i, czar peter i, darius i, decisive factor, demetrius i, determining factor, edmund i, edward i, elizabeth i, equivalent-binary-digit factor, ethelred i, factor, factor analyse, factor analysis, factor analytic, factor analytical, factor analyze, factor ii, factor iii, factor in, factor iv, factor ix, factor of proportionality, factor of safety, factor out, factor v, factor vii, factor viii, factor x, factor xi, factor xii, factor xiii, farouk i, faruk i, ferdinand i, francis joseph i, franz josef i, frederick i, frederick william i, fudge factor, gaudi i cornet, george i, gravida i, greatest common factor, gregory i, growth factor, growth hormone-releasing factor, gustavus i, hageman factor, harold i, henry i, highest common factor, human factor, hypothalamic releasing factor, i, i chronicles, i corinthians, i esdra, i john, i kings, i maccabees, i o u, i peter, i samuel, i thessalonians, i timothy, intrinsic factor, isabella i, james i, jeroboam i, john paul i, jomada i, jumada i, justinian i, kamehameha i, king harold i, king james i, leo i, letter i, load factor, louis i, mary i, multiplier factor, napoleon i, nerve growth factor, nicholas i, osman i, othman i, otho i, otto i, para i, peter i, phase i, phase i clinical trial, prime factor, ptolemy i, rabi i, reflection factor, releasing factor, rh factor, rhesus factor, rheumatoid factor, richard i, robert i, safety factor, saint gregory i, salt i, samoa i sisifo, scale factor, seleucus i, seleucus i nicator, sixteen personality factor questionnaire, spreading factor, st. gregory i, st. leo i, stable factor, sun protection factor, theodosius i, thyrotropin-releasing factor, time-scale factor, tumor necrosis factor, tumour necrosis factor, type i allergic reaction, type i diabetes, vatican i, william i, world war i, xerxes i, yuck factor