n.1.(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.
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When hydrothorax was investigated by surgery or pleuroscopy, these discontinuities appeared as blisters or blebs on the diaphragmatic pleuroperitoneum.