The rare daily word game sweeping the globe. Find what's hidden in plain sight.
PERITONEUM
Definition of PERITONEUM
noun
In mammals, the serous membrane lining the cavity of the abdomen and that is folded over the viscera.
Wiktionary · CC BY-SA
Where it comes from
From Latin peritonaeum, from Ancient Greek περιτόναιον (peritónaion), from περιτόναιος (peritónaios, “stretched or strained over”).
Etymology via Wiktionary (CC BY-SA).
Word DNA
Line of descent
- Ancient Greek
- Latin
- English
2 recorded generations before English.
Deepest traced root
3rd
of 59 source languages in OUTLIER
12.2%
of traced words share this origin (9,477)
branch · 12.2% of traced words
How it is built
Same root, PERITONEUM · 5 relatives in the game
OUTLIER scores every word on how unusual it is, and that number is not published. Working it out at the board is the game.
PERITONEUM in OUTLIER
Players have found it on 20 boards so far. 22 players have found it across Outlier's history.
It first turned up on Day 7, 28 May 2026. The most recent board was Day 154, 21 October 2026. Nobody has seen it on a board for 2 days.
First found by a player on Day 7, 28 May 2026.
Built from these letters
PERITONEUM starts with P and ends with M. Sorted, its letters read EEIMNOPRTU - the shape to hunt for when the grid is scrambled. E appears more than once.
Words that start PERITO
Its neighbours in the OUTLIER dictionary - shortest first.
Also seen on Day 7
Could you have found PERITONEUM?
OUTLIER is a daily word game. One grid, the same grid for everybody, and the words nobody else spots are the ones that pay. This word was on Day 7 - and most players walked straight past it.
Play today's OUTLIER