factor iv

English Thesaurus

1. ion of calcium; a factor in the clotting of blood (noun.substance)

hypernym	:	atomic number 20, ca, calcium,
definition	:	a white metallic element that burns with a brilliant light; the fifth most abundant element in the earth's crust; an important component of most plants and animals (noun.substance)

hypernym	:	clotting factor, coagulation factor,
definition	:	any of the factors in the blood whose actions are essential for blood coagulation (noun.substance)