: a red-brown to blue-black crystalline salt C34H32N4O4FeCl derived from oxidized heme but usually obtained in a characteristic crystalline form from hemoglobin
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“Hemin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hemin. Accessed 3 Nov. 2025.
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hemin
noun
he·min
variants
or chiefly British haemin
: a red-brown to blue-black crystalline salt C34H32N4O4FeCl that inhibits the biosynthesis of porphyrin and is used to ameliorate the symptoms of some forms of porphyria
called also protohemin
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