Anterior to or preceding the pylorus; denoting a temporary constriction of the wall of the stomach separating the fundus from the antrum during digestion.
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pre·py·lo·ric .prē-pī-'lōr-ik adj situated or occurring anterior to the pylorus <\prepyloric ulcers>
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pre·py·lor·ic (pre″pi-lorґik) proximal to the pylorus or pyloric part of the stomach.Medical dictionary. 2011.