• synonyms


or met·hae·mo·glo·bin

[met-hee-muh-gloh-bin, -hem-uh-, -hee-muh-gloh-, -hem-uh-]
noun Biochemistry.
  1. a brownish compound of oxygen and hemoglobin, formed in the blood, as by the use of certain drugs.
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Origin of methemoglobin

First recorded in 1865–70; met- + hemoglobin
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

methemoglobin in Medicine


  1. A brownish-red crystalline organic compound formed in the blood when hemoglobin is oxidated either by decomposition of the blood or by the action of various oxidizing drugs or toxic agents. It contains iron in the ferric state and cannot function as an oxygen carrier.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.