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Webster's 1913 Dictionary

METHAEMOGLOBIN

Met `hæm *o *glo "bin ( or ), n. Etym: [Pref. met- + h.] (Physiol. Chem. )

Defn: A stable crystalline compound obtained by the decomposition of hemoglobin. It is found in old blood stains.

Oxford Dictionary

methaemoglobin

methaemoglobin |ˌmɛθiːməˈgləʊbɪn, mɛtˌhiː - |(US methemoglobin ) ▶noun [ mass noun ] Biochemistry a stable oxidized form of haemoglobin which is unable to release oxygen to the tissues, produced in some inherited abnormalities and by oxidizing drugs.

methaemoglobinaemia

methaemoglobinaemia |ˌmɛθiːməˌgləʊbɪˈniːmɪə, mɛtˌhiː - |(US methemoglobinemia ) ▶noun [ mass noun ] Medicine the presence of methaemoglobin in the blood.