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heme

[heem]

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noun Biochemistry.

a deep-red iron-containing blood pigment, C₃₄H₃₂N₄O₄Fe, obtained from hemoglobin.

Origin:
1920–25; shortened form of hematin

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Heme is always a great word to know.

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Symbol: K; atomic weight: 39.102; atomic number: 19

Symbol: Sb; atomic weight: 121.75; atomic number: 51

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Collins

World English Dictionary

haem or (US) heme (hiːm)

—n
	biochem a complex red organic pigment containing ferrous iron, present in haemoglobin

[C20: shortened from haematin]

heme or (US) heme

—n

[C20: shortened from haematin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage

Medical Dictionary

heme (hēm)
n.
The deep red, oxygen-carrying, nonprotein, ferrous component of hemoglobin. Also called reduced hematin.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage

Science Dictionary

heme (hēm) Pronunciation Key
The deep red, nonprotein, iron-containing component of hemoglobin that carries oxygen. Heme is a porphyrin with an iron atom at its center. One of the free valence electrons of the iron atom of heme is bound to the hemoglobin molecule, while the other is available for binding to an oxygen atom. A hemoglobin molecule contains four hemes. Chemical formula: C₃₄H₃₂FeN₄O₄.

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Related Words

bilirubin chromoprotein hematin

hemoglobin porphyrin prosthetic group

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