Webster's English Dictionary

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peritoneum

peri.to.ne.um \.per-*t-*n-'e--*m\ \-'e--*mz\ \-'e--*\ n or peri.to.ne.ums 
   or peri.to.nea [LL, fr. Gk peritonaion, neut. of peritonaios stretched 
   around, fr.] pl  peri- + tenein to stretch - more at THIN 1: the smooth 
   transparent serous membrane that lines the cavity of the abdo men of a 
   mammal and is reflected inward over the abdominal and pelvic viscera 2: 
   PLEUROPERITONEUM