单词	pernicious anemia
释义	pernicious anemia noun : a severe megaloblastic anemia that is marked by a progressive decrease in the number of red blood cells and by pallor, weakness, and gastrointestinal and nervous disturbances and is caused by malabsorption of vitamin B12 due to the absence of intrinsic factor Word History First Known Use 1874, in the meaning defined above Medical Definition pernicious anemia noun : a severe hyperchromic anemia marked by a progressive decrease in number and increase in size and hemoglobin content of the red blood cells and by pallor, weakness, and gastrointestinal and nervous disturbances and associated with reduced ability to absorb vitamin B12 due to the absence of intrinsic factor called also addisonian anemia
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