[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 , formed in the blood, as by the use of certain drugs.

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.


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