Source : Webster's Revised Unabridged Dictionary (1913)

Pylorus \Py*lo"rus\, n.; pl. {Pylori}. [L., fr. Gr. ? pylorus,
   gate keeper; ? a gate + ? watcher, guardian.] (Anat.)
   (a) The opening from the stomach into the intestine.
   (b) A posterior division of the stomach in some
       invertebrates.

Source : WordNet®

pylorus
     n : a small circular opening between the stomach and the
         duodenum
     [also: {pylori} (pl)]

pylori
     See {pylorus}