retroperitoneum

noun
ret·​ro·​per·​i·​to·​ne·​um | \-ˌper-ət-ᵊn-ˈē-əm \
plural retroperitoneums or retroperitonea\-​ˈē-​ə \

Medical Definition of retroperitoneum 

: the space between the peritoneum and the posterior abdominal wall that contains especially the kidneys and associated structures, the pancreas, and part of the aorta and inferior vena cava

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