D defs.my
Entry 1 sense Webster, 1913

Peritoneum

· Per·i·to·ne·um · IPA /ˌpɛ.ɹɪ.təˈniː.əm/
01 n. The smooth serous membrane which lines the cavity of the abdomen, or the whole body cavity when there is no diaphragm, and, turning back, s…
  1. 1.
    The smooth serous membrane which lines the cavity of the abdomen, or the whole body cavity when there is no diaphragm, and, turning back, surrounds the viscera, forming a closed, or nearly closed, sac.(Anat.)