Skip to Content
Medical Term:


Pronunciation: pi-lōr′ŭs, pī-lōr′ī


  1. The muscular tissue surrounding and controlling the aboral outlet of the stomach.
  2. A muscular or myovascular device to open (musculus dilator) and to close (musculus sphincter) an orifice or the lumen of an organ.

[L. fr. G. pylōros, a gatekeeper, the pylorus, fr. pylē, gate, + ouros, a warder]