Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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aplastic anemia a type of anemia caused by inadequate production of leukocytes, platelets, and the like by the bone marrow.
pernicious anemia a severe anemia in which red blood cells decrease in number and increase in size that is caused largely by a deficiency of vitamin B12.
sickle cell anemia a hereditary form of anemia caused by the presence of abnormal sickle-shaped red blood cells and abnormal hemoglobin, resulting in abdominal pain and leg ulcers.