pleuroperitoneum

Pleu`ro*per`i*to*ne"um, n. Etym: [Pleuro- + peritoneum.] (Anat.) Defn: The pleural and peritoneal membranes, or the membrane lining the body cavity and covering the surface of the inclosed viscera; the peritoneum; -- used especially in the case of those animals in which the body cavity is not divided. Note: Peritoneum is now often used in the sense of pleuroperitoneum, the pleuræ being regarded as a part of the peritoneum, when the body cavity is undivided.

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