Definition of peritoneum noun from the Oxford Advanced Learner's Dictionary

 

peritoneum

 noun
noun
BrE BrE//ˌperɪtəˈniəm//
 
; NAmE NAmE//ˌperɪtəˈniəm//
 
(pl. peritoneums, peritonea
BrE BrE//ˌperɪtəˈniə//
 
; NAmE NAmE//ˌperɪtəˈniə//
 
)
(anatomy)
 
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the membrane (= very thin layer of tissue) on the inside of the abdomen that covers the stomach and other organs Word Origin late Middle English: via late Latin from Greek peritonaion, from peritonos ‘stretched round’, from peri- ‘around’ + -tonos ‘stretched’.
See the Oxford Advanced American Dictionary entry: peritoneum