[ret″ro-per″ĭ-to-ne´um] the retroperitoneal space; the space between the peritoneum and the posterior abdominal wall.
ret·ro·per·i·to·ne·al space
[TA] the space between the parietal peritoneum and the muscles and bones of the posterior abdominal wall. Synonym(s): spatium retroperitoneale [TA], retroperitoneum
ret·ro·per·i·to·ne·um
(ret'rō-per'i-tŏ-nē'ŭm) Area behind the peritoneum. [retro- + peritoneum]