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What is the medical term meaning blood disorder in which red blood cells are larger than normal?

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Macrocytosis is the term meaning abnormally large red blood cells. Macrocytosis is seen in a number of RBC disorders. Megaloblastic anemia is one of the best characterized ones. It is cause by vitamin B12 deficiency.
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What is the medical term meaning immature red blood cells?

An immature red blood cell is called a reticulocyte. They are  produced in the bone marrow and live for about 120 days as mature  red blood cells (erythrocytes).    I