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pylorus In vertebrates, the region of the stomach that lies next to the duodenum.

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pylorus (py-lor-ŭs) n. the lower end of the stomach, which leads to the duodenum. It terminates at a ring of muscle (pyloric sphincter), which contracts to close the opening by which the stomach communicates with the duodenum.
pyloric adj.

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pylorus (anat.) opening from the stomach into the duodenum. XVII. — Late L. pylōrus- — Gr. pulōrós, pulourós gate-keeper, f. púlē gate + oûros watcher, warder.