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pylorus (n.)

"orifice of communication between the stomach and intestines," 1610s, from Late Latin pylorus "the lower orifice of the stomach," from Greek pylōros "lower orifice of the stomach," literally "gatekeeper, porter," from pylē "gate" (see pylon) + ouros "watcher, guardian" (from PIE root *wer- (3) "perceive, watch out for"). Related: Pyloric.

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Definitions of pylorus from WordNet

pylorus (n.)
a small circular opening between the stomach and the duodenum;
From wordnet.princeton.edu