Etymology
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peritoneum (n.)

"membrane lining the abdominal cavity," early 15c., from Late Latin peritonaeum, from Greek peritonaion "abdominal membrane," literally "part stretched over," noun use of neuter of peritonaios "stretched over," from peri "around" (see peri-) + teinein "to stretch," from PIE root *ten- "to stretch." Related: Peritoneal.

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Definitions of peritoneum

peritoneum (n.)
a transparent membrane that lines the abdominal cavity in mammals and covers most of the viscera;
From wordnet.princeton.edu