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pylorus py·lo·rus (pī-lôr'əs)
n. pl. py·lo·ri (-lôr'ī')
The passage at the lower end of the stomach that opens into the duodenum.
A muscular or myovascular structure that opens or closes an orifice or lumen of an organ.
cone-shaped constriction in the gastrointestinal tract that demarcates the end of the stomach and the beginning of the small intestine. The main functions of the pylorus are to prevent intestinal contents from reentering the stomach when the small intestine contracts and to limit the passage of large food particles or undigested material into the intestine.