/ Dictionary / Index P pylorus: Meaning and Definition of Find definitions for: py•lo•rus Pronunciation: (pī-lôr'us, -lōr'-, pi-), [key] — pl. -lo•ri the opening between the stomach and the duodenum. See diag. under Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pylorus (Thesaurus) pyloroplasty Pylos Related Content Daily Word Quiz: miscreant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language