peritoneum
serous membrane that forms the lining of the abdominal cavity or the coelom—it covers most of the intra-abdominal (or coelomic) organs—in amniotes and some invertebrates
en-US/ˌpɛɹɪˈtəniəm/
en-GB/ˌpɛɹɪˈtəʊniːəm/
serous membrane that forms the lining of the abdominal cavity or the coelom—it covers most of the intra-abdominal (or coelomic) organs—in amniotes and some invertebrates