from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A severe anemia most often affecting older adults, caused by failure of the stomach to absorb vitamin B12 and marked by a decrease in number and an increase in the size of red blood cells, by gastrointestinal disturbances, and by lesions of the spinal cord.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun pathology A
severeform of anemiacaused by vitaminB12 insufficiency.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun 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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