pyloric sphincter

n.
A ring of smooth muscle fibers around the opening of the stomach into the duodenum.

n.

A thickening of the layer of the gastric musculature encircling the gastroduodenal junction. Also called sphincter muscle of pylorus.

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The noun has one meaning:

Meaning #1: the sphincter muscle of the pylorus that separates the stomach from the duodenum
  Synonyms: pyloric valve, musculus sphincter pylori

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