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A blue to blackish-brown compound, C34H32N4O4·FeOH, formed in the decomposition of hemoglobin.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.



an unstable, deep red, iron-containing blood pigment, C34H32N4O4Fe, obtained from hemoglobin.
[1920–25; shortening of hemoglobin]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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)
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
Husain [15] reported that at the concentration of hydrogen peroxide greater than 0.75 mM, peroxidase activity was inhibited by irreversibly oxidizing the enzyme ferriheme group, essential for peroxidase activity.
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.
The heme protein is a tetramer composed of two copies each of two nonidentical subunits (beta and gamma) and contains 1 mol of ferriheme per mol of protein.