pīˈlōrəs, pə̇ˈl-, -lȯr- noun
( plural pylo·ri -ōrˌī, -ȯˌrī ; also pyloruses )
Etymology: Late Latin, from Greek pylōros gatekeeper, pylorus, from pylē gate — more at pylon
1. : the opening in a vertebrate from the stomach into the intestine — see pyloric valve
2. : a posterior division of the stomach or midgut in some invertebrates commonly separated from the posterior intestine by a valvular fold or sphincter