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A blue to blackish-brown compound, C34H32N4O4·FeOH, formed in the decomposition of hemoglobin.



an unstable, deep red, iron-containing blood pigment, C34H32N4O4Fe, obtained from hemoglobin.
[1920–25; shortening of hemoglobin]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.hematin - a complex red organic pigment containing iron and other atoms to which oxygen binds
pigment - dry coloring material (especially a powder to be mixed with a liquid to produce paint, etc.)
haemoglobin, Hb, hemoglobin - a hemoprotein composed of globin and heme that gives red blood cells their characteristic color; function primarily to transport oxygen from the lungs to the body tissues; "fish have simpler hemoglobin than mammals"
myoglobin - a hemoprotein that receives oxygen from hemoglobin and stores it in the tissues until needed
cytochrome - (biochemistry) a class of hemoprotein whose principal biological function is electron transfer (especially in cellular respiration)
References in periodicals archive ?
When the haptoglobin is saturated, the excess hemoglobin (usually now in the oxidized methemoglobin form) will release free ferriheme, which first binds to albumin, forming methemalbumin, followed by transfer to another protective plasma protein, hemopexin.