methemoglobin

noun
met·he·mo·glo·bin | \ˌmet-ˈhē-mə-ˌglō-bən \

Definition of methemoglobin 

: a soluble brown crystalline basic blood pigment that differs from hemoglobin in containing ferric iron and in being unable to combine reversibly with molecular oxygen

First Known Use of methemoglobin

1870, in the meaning defined above

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The first known use of methemoglobin was in 1870

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methemoglobin

noun
met·he·mo·glo·bin
variants: or chiefly British methaemoglobin \(ˈ)met-ˈhē-mə-ˌglō-bən \

Medical Definition of methemoglobin 

: a soluble brown crystalline basic blood pigment that is found in normal blood in much smaller amounts than hemoglobin, that is formed from blood, hemoglobin, or oxyhemoglobin by oxidation, and that differs from hemoglobin in containing ferric iron and in being unable to combine reversibly with molecular oxygen

called also ferrihemoglobin

More from Merriam-Webster on methemoglobin

Britannica.com: Encyclopedia article about methemoglobin

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