peritoneum

[per-i-tn-ee-uhm]
noun, plural peritoneums, peritonea [per-i-tn-ee-uh] . Anatomy.
the serous membrane lining the abdominal cavity and investing its viscera.

Origin:
1535–45; < Late Latin, variant spelling of peritonaeum < Greek peritónaion, noun use of neuter of peritónaios, synonymous derivative of perítonos stretched round. See peri-, tone, -eous

peritoneal, adjective
peritoneally, adverb
preperitoneal, adjective
subperitoneal, adjective
transperitoneal, adjective
transperitoneally, adverb
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World English Dictionary
peritoneum (ˌpɛrɪtəˈniːəm)
 
n , pl -nea, -neums
a thin translucent serous sac that lines the walls of the abdominal cavity and covers most of the viscera
 
[C16: via Late Latin from Greek peritonaion, from peritonos stretched around, from peri- + tenein to stretch]
 
perito'neal
 
adj

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Etymonline
Word Origin & History

peritoneum
1540s, from L.L. peritonaeum (c.420), from Gk. peritonaion "abdominal membrane," lit. "part stretched over," from neut. of peritonaios "stretched over," from peri- "around" + teinein "to stretch" (see tenet).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

peritoneum per·i·to·ne·um or per·i·to·nae·um (pěr'ĭ-tn-ē'əm)
n. pl. per·i·to·ne·a or per·i·to·nae·a (-tn-ē'ə)
The serous sac consisting of mesothelium and a thin layer of irregular connective tissue that lines the abdominal cavity, covers most of the viscera contained therein, and itself forms two cavities, the peritoneal and the omental bursa, which are connected by the epiploic foramen.


per'i·to·ne'al adj.
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American Heritage
Science Dictionary
peritoneum   (pěr'ĭ-tn-ē'əm)  Pronunciation Key 
Plural peritonea
The membrane that lines the walls of the abdomen and the pelvis (called the parietal peritoneum) and encloses the abdominal and pelvic organs (called the visceral peritoneum.) The space between the two, the peritoneal cavity, fills with inflammatory cells and pus when the peritoneum becomes infected.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Every time someone touched her abdomen, she winced, a reaction to the blood
  irritating her peritoneal lining.
He had placed the devices into the frogs' peritoneal cavity, a space within its
  belly that contains its stomach, guts and liver.
The line of peritoneal reflection from the lateral surface is raised to the
  level of the obliterated hypogastric artery.
It is imbedded in areolar and fatty tissue and entirely devoid of peritoneal
  covering.
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