单词	methemoglobin
释义	methemoglobin noun met·​he·​mo·​glo·​bin ˌmet-ˈhē-mə-ˌglō-bən  : 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 Example Sentences Recent Examples on the Web Typical levels of methemoglobin in the blood range from 0% to 2%. Beth Mole, Ars Technica, 23 Sep. 2019 Lab tests showed that the Rhode Island woman’s percentage of methemoglobin was 44%. Beth Mole, Ars Technica, 23 Sep. 2019 So, methemoglobinemia is a rare blood disorder that causes people to produce an abnormal amount of methemoglobin. Maggie O'neill, Health.com, 19 Sep. 2019 Word History Etymology International Scientific Vocabulary First Known Use 1870, in the meaning defined above Medical Definition methemoglobin noun met·​he·​mo·​glo·​bin variants or chiefly British methaemoglobin (ˈ)met-ˈhē-mə-ˌglō-bən  : 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
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