factor IV

/ˌˈaɪ ˌvi/
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Definitions of factor IV
  1. noun
    ion of calcium; a factor in the clotting of blood
    synonyms: calcium ion
    see moresee less
    type of:
    Ca, atomic number 20, calcium
    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
    clotting factor, coagulation factor
    any of the factors in the blood whose actions are essential for blood coagulation
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