hydroperitoneum

noun
hy·​dro·​peri·​to·​ne·​um | \ -ˌper-ət-ᵊn-ˈē-əm How to pronounce hydroperitoneum (audio) \
plural hydroperitonea\ -​ˈē-​ə How to pronounce hydroperitonea (audio) \ or hydroperitoneums

Medical Definition of hydroperitoneum