methemoglobin Hear it!

methemoglobin Definition

met·hemo·glo·bin (met hē′mō glō′bin, -mə-; -hem′ō-, -ə-)

noun

a brownish, crystalline substance containing ferric iron, formed in the blood by the oxidation of hemoglobin, as by the action of certain drugs or in the decomposition of the blood, and no longer able to combine reversibly with oxygen

Etymology: met(a)- + hemoglobin