Hemin

noun

1. 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.
2. A crystalline substance which may be obtained from hematin on treating it with salt and glacial acetic acid. Its formula is C34H33N4O4FeCl. The crystals are quite characteristic in appearance, and their formation has for many years represented one of the most important tests for blood-coloring matter. See Teichmann's crystals.
3. A substance, in the form of reddish brown, microscopic, prismatic crystals, formed from dried blood by the action of strong acetic acid and common salt; -- called also Teichmann's crystals. Chemically, it is a hydrochloride of hematin.
4. a reddish brown substance produced in a laboratory test for the presence of blood by reaction with glacial acetic acid and sodium chloride
5. a reddish-brown chloride of heme; produced from hemoglobin in laboratory tests for the presence of blood