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 pleuræ being regarded as a part of
the peritoneum, when the body cavity is undivided.