Hypertext Webster Gateway: "peritoneum"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Peritoneum \Per`i*to*ne"um\, n. [L. peritoneum, peritonaeum, Gr.
?, ?, fr. ? to stretch all around or over; ? around + ? to
stretch.] (Anat.)
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. [Written also {periton[ae]um}.]
From WordNet (r) 1.7 (wn)
peritoneum
n : a transparent membrane that lines the abdominal cavity in
mammals and covers most of the viscera
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