The presence of gas and serous fluid in the peritoneal cavity. ... Synonym: pneumohydroperitoneum. ... Origin: hydro-+ G. Pneuma, air, + peritoneum ... (05 Mar 2000) ... 
Type: Term Pronunciation: hī′drō-nū′mō-per-i-tō-nē′ŭm Definitions: 1. The presence of gas and serous fluid in the peritoneal cavity. Synonyms: pneumohydroperitoneum