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heme

[ heem ]
/ him /
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noun Biochemistry.
a deep-red iron-containing blood pigment, C34H32N4O4Fe, obtained from hemoglobin.

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Origin of heme

First recorded in 1920–25; shortened form of hematin
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use heme in a sentence

  • Heme instantly drew forth a hunting-knife, and cutting Fenwolf's bonds asunder, the latter started to his feet.

    Windsor Castle|William Harrison Ainsworth

Scientific definitions for heme

heme
[ hēm ]

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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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