A ring of smooth muscle fibers around the opening of the stomach into the duodenum.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "pyloric sphincter" in a sentence
"Emetine creates nausea within five to eight minutes; pilocarpine contracts the pyloric sphincter and inhibits the emptying of the stomach into the duodenum; and ephedrine controls blood pressure fluctuations."