hemin(redirected from factor X for Haemophilus)
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The reddish-brown crystalline chloride of heme, C34H32N4O4FeCl, produced when hemoglobin reacts with glacial acetic acid and sodium chloride in a laboratory test for the presence of blood.
a crystalline substance, C34H32N4O4FeCl, that forms when blood is mixed with sodium chloride and pure acetic acid and heated: used as a test for the presence of blood in stains.
[1855–60; < Greek haîm(a) blood + -in1]