peritoneum
noun
peri·to·ne·um
ˌper-ə-tə-ˈnē-əm
plural peritoneums
ˌper-ə-tə-ˈnē-əmz
or peritonea
ˌper-ə-tə-ˈnē-ə
: the smooth transparent serous membrane that lines the cavity of the abdomen of a mammal and is folded inward over the abdominal and pelvic viscera
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Merriam-Webster unabridged
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