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or methaemoglobin

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