from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A ring of smooth muscle fibers around the opening of the stomach into the duodenum.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Muscular valve connecting the stomach to the duodenum and regulating flow of materials out of the stomach.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the sphincter muscle of the pylorus that separates the stomach from the duodenum
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