from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A severe anemia most often affecting older adults, caused by failure of the stomach to absorb vitamin B12 and characterized by abnormally large red blood cells, gastrointestinal disturbances, and lesions of the spinal cord.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A severe form of anemia caused by vitamin B12 insufficiency.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a chronic progressive anemia of older adults; thought to result from a lack of intrinsic factor (a substance secreted by the stomach that is responsible for the absorption of vitamin B12)
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