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Definition of: pylorus
(pī·lôr′əs, -lō′rəs, pi-) noun plural ·ri (-rī) Anat.
The opening between the stomach and the duodenum, surrounded by circular muscle fibers; also, the adjoining portion of the stomach. [<LL <Gk. pylōros a gatekeeper <pylē a gate + ouros a watcher]
—py·lor′ic (-lôr′ik, -lor′ik) adjective
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