peritoneums

/P ER0 IH1 T AH0 N IY1 AH0 M Z/
noun
  1. 1

    In mammals, the serous membrane lining the cavity of the abdomen and that is folded over the viscera.

  2. 2

    In animals, the membrane lining the coelom cavity.

Source: https://en.wiktionary.org/wiki/peritoneum, https://en.wiktionary.org/wiki/peritoneums