peritoneum

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

Definition of peritoneum

plural peritoneums play \ˌper-ə-tə-ˈnē-əmz\ or -nea play \ˌper-ə-tə-ˈnē-ə\
: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 \ˌper-ə-tə-ˈnē-əl\ adjective

peritoneally

play \ˌper-ə-tə-ˈnē-ə-lē\ adverb

Recent Examples of peritoneum from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'peritoneum.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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


Medical Dictionary

peritoneum

noun peri·to·ne·um
variants: or chiefly British peritonaeum play \ˌper-ət-ᵊn-ˈē-əm\

medical Definition of peritoneum

plural peritoneums or chiefly British -naeums play \-ˈē-əmz\ or -nea or chiefly British peritonaea play \-ˈē-ə\
: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

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).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

to buzz or drone

Get Word of the Day daily email!

Test Your Vocabulary

Find the Cousins

  • a-large-tree-with-many-branches
  • Which pair shares a common word ancestor?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Bee Cubed

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

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!