The rare daily word game sweeping the globe. Find what's hidden in plain sight.
PEROXIDE
Definition of PEROXIDE
noun
A divalent radical or anion containing two oxygen atoms linked by a covalent bond; any substance containing this group yields hydrogen peroxide when treated with an acid.
Wiktionary · CC BY-SA
Where it comes from
From per- + oxide.
Etymology via Wiktionary (CC BY-SA).
OUTLIER scores every word on how unusual it is, and that number is not published. Working it out at the board is the game.
PEROXIDE in OUTLIER
Players have found it on 9 boards so far. 30 players have found it across Outlier's history.
It first turned up on Day 16, 5 June 2026. The most recent board was Day 98, 26 August 2026. It was on the latest finished board.
First ever to find it
on Day 16, 5 June 2026 - before anyone else in Outlier's history. See the Pioneers
Built from these letters
PEROXIDE starts with P and ends with E. Sorted, its letters read DEEIOPRX - the shape to hunt for when the grid is scrambled. E appears more than once. It uses X - among the least common letters in written English.
Words that start PEROXI
Its neighbours in the OUTLIER dictionary - shortest first.
Also seen on Day 16
Could you have found PEROXIDE?
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 16 - and most players walked straight past it.
Play today's OUTLIER