Skip to Content
Medical Term:


Pronunciation: per′i-tō-nē′ŭm, -ă

Definition: The serous sac, consisting of mesothelium and a thin external layer of irregular connective tissue, that lines the abdominopelvic cavity and covers most of the viscera contained therein; it forms two sacs: the peritoneal (or greater) sac and the omental bursa (lesser sac) connected by the omental foramen.

Synonym(s): membrana abdominis

[Mod. L. fr. G. peritonaion, fr. periteinō, to stretch over]