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sphincter British & World English

A ring of muscle surrounding and serving to guard or close an opening or tube, such as the anus or the openings of the stomach

sphincter of Oddi in Oddi British & World English

With of and in the genitive, especially in sphincter of Oddi. Designating a ring of smooth muscle in the ampulla of Vater, which controls the flow of bile and pancreatic secretions into the duodenum.