Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

peritoneum

play
noun peri·to·ne·um \ˌper-ə-tə-ˈnē-əm\

Definition of peritoneum

plural

peritoneums

play \-ˈnē-əmz\ or

-nea

\-ˈnē-ə\
  1. :  the smooth transparent serous membrane that lines the cavity of the abdomen of a mammal and is folded inward over the abdominal and pelvic viscera

peritoneal

play \-ˈnē-əl\ adjective

peritoneally

play \-ə-lē\ adverb


Origin and Etymology of peritoneum

Middle English, from Late Latin, from Greek peritonaion, neuter of peritonaios stretched around, from peri- + teinein to stretch — more at thin


First Known Use: 15th century


Medical Dictionary

peritoneum

noun peri·to·ne·um

Medical Definition of peritoneum

plural

peritoneums

or chiefly British

peritonaeums

\-ˈē-əmz\play or

peritonea

or chiefly British

peritonaea

\-ˈē-ə\play
  1. :  the smooth transparent serous membrane that lines the cavity of the abdomen of a mammal, is folded inward over the abdominal and pelvic viscera, and consists of an outer layer closely adherent to the walls of the abdomen and an inner layer that folds to invest the viscera—see parietal peritoneum, visceral peritoneum; compare mesentery 1



Variants of peritoneum

or chiefly British

peritonaeum

\ˌper-ət-ən-ˈē-əm\play

Learn More about peritoneum


Seen and Heard

What made you want to look up peritoneum? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

a secret group of plotters

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

dog-eating-apple

Which is a synonym of asperse?

placate beat divulge defame
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ