Pleu`ro*per`i*to*ne"um (?), n. [Pleuro- + peritoneum.] Anat.
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.
⇒ Peritoneum is now often used in the sense of pleuroperitoneum, the pleurae being regarded as a part of the peritoneum, when the body cavity is undivided.
© Webster 1913.