Breadcrumb Home > Dictionary > Index P peritoneum: Meaning and Definition of Find definitions for: per•i•to•ne•um Pronunciation: (per"i-tn-ē'um), [key] — pl. -to•ne•ums, -to•ne•a the serous membrane lining the abdominal cavity and investing its viscera. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: peritoneum (Thesaurus) peritonealize peritonitis TrendingHere are the facts and trivia that people are buzzing about. Chinese New Year History, Meaning, and Celebrations Current Events This Week: February 2024 Valentine's Day Valentine's Day History Mardi Gras 30 "Charlie and the Chocolate Factory" Quotes ✖ Related Content Daily Word Quiz: turgid Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language