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[met-hee-muh-gloh-bin, -hem-uh-, -hee-muh-gloh-, -hem-uh-] /mɛtˈhi məˌgloʊ bɪn, -ˈhɛm ə-, -ˌhi məˈgloʊ-, -ˌhɛm ə-/
noun, Biochemistry
a brownish compound of oxygen and hemoglobin, formed in the blood, as by the use of certain drugs.
Also called ferrihemoglobin, hemiglobin.
Origin of methemoglobin
1865-70; met- + hemoglobin Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for methemoglobin
  • methemoglobin occurs when the iron that is part of hemoglobin is changed so that it does not carry oxygen well.
  • However, this method is not specific for nitrobenzene, as many toxic chemicals produce methemoglobin.
  • methemoglobin can be measured in the blood, but exposure to many other chemicals also increase methemoglobin levels in the blood.
methemoglobin in Medicine

methemoglobin met·he·mo·glo·bin (mět-hē'mə-glō'bĭn)
Abbr. metHb
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.

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