aplastic anemia

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A form of anemia in which the capacity of the bone marrow to generate red blood cells is defective. This anemia may be caused by bone marrow disease or exposure to toxic agents, such as radiation, chemicals, or drugs.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Med.) an anemia characterized by substantial reduction or cessation of production of red blood cells and hemoglobin by the bone marrow.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun anemia characterized by pancytopenia resulting from failure of the bone marrow; can be caused by neoplasm or by toxic exposure