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A ring of smooth muscle fibers around the opening of the stomach into the duodenum.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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|Noun||1.||pyloric sphincter - the sphincter muscle of the pylorus that separates the stomach from the duodenum|
pylorus - a small circular opening between the stomach and the duodenum
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