Entry 1 sense Webster, 1913 Pleuroperitoneal · Pleu·ro·per·i·to·ne·al · IPA 01 a. Of or pertaining to the pleural and peritoneal membranes or cavities, or to the pleuroperitoneum. 1. Of or pertaining to the pleural and peritoneal membranes or cavities, or to the pleuroperitoneum.(Anat.)