Pleuroperitoneum
Pronunciation : Pleu`ro*per`i*to*ne"um
Part of Speech : n.
Etymology : [Pleuro- + peritoneum.] (Anat.)
Definition : 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 pleur? being regarded as a part of the peritoneum, when the body cavity is undivided.
Source : Webster's Unabridged Dictionary, 1913