from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A substance that is secreted by the gastric mucous membrane and is essential for the absorption of vitamin B12 in the intestines.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a substance produced by the mucosa of the stomach and intestines that is essential for the absorption of vitamin B12
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