serous
adjective medical specialized uk/ˈsɪə.rəs/ us/ˈsɪr.əs/
血清的
relating to serum (= the clear, watery part of any liquid in the body)
Peritonitis is an inflammation of the peritoneum, the serous membrane which lines part of the abdominal cavity. 腹膜炎是腹膜，也就是部分包裹腹腔的血清膜发生的炎症。