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: Webster's Revised Unabridged Dictionary (1913)