peritoneum (n.), peritoneal (adj.)

synonym: peritoneal membrane
https://doi.org/10.1351/goldbook.11082

Thin double layer of mesothelium and irregular connective tissue that lines the abdominal cavity and covers most of the abdominal organs.

Note: The two layers of the peritoneum consist of the parietal peritoneum that lines the abdominal wall and the visceral peritoneum that covers the abdominal organs.
Source:
PAC, 2016, 88, 713. (Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)) on page 791 [Terms] [Paper]