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.
See also: peritoneal cavity
Source:
PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 791 (https://doi.org/10.1515/pac-2015-1202)