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NCI Dictionary of Cancer Terms

methemoglobin  listen  (met-HEE-moh-GLOH-bin)

  A form of hemoglobin found in the blood in small amounts. Unlike normal hemoglobin, methemoglobin cannot carry oxygen. Injury or certain drugs, chemicals, or foods may cause a higher-than-normal amount of methemoglobin to be made. This causes a condition called methemoglobinemia.