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permanence
permanent
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permanent-income savings motive
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peritoneum

per·i·to·ne·um [ pèrrət'n  əm ] (plural per·i·to·ne·ums or per·i·to·ne·a [ pèrrət'n  ə ])


noun 
Definition:
 
abdominal lining: a smooth transparent membrane that lines the abdomen and doubles back over the surfaces of the internal organs to form a continuous sac

[Mid-16th century. Via late Latin< Greek peritoneion< peritonos "stretched around" < teinein "to stretch"]

per·i·to·ne·al adjective
per·i·to·ne·al·ly adverb
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