The rare daily word game sweeping the globe. Find what's hidden in plain sight.
SULFONIUM
Definition of SULFONIUM
noun
the univalent H3S cation, derived from sulfane
Wiktionary · CC BY-SA
Where it comes from
From sulfo- + onium.
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.
SULFONIUM in OUTLIER
Players have found it on 1 board so far.
It first turned up on Day 99, 27 August 2026. Nobody has seen it on a board for 3 days.
First ever to find it
on Day 99, 27 August 2026 - before anyone else in Outlier's history. See the Pioneers
Built from these letters
SULFONIUM starts with S and ends with M. Sorted, its letters read FILMNOSUU - the shape to hunt for when the grid is scrambled. U appears more than once.
Same letters, different word
One other word uses exactly these letters. Worth knowing at the board: an anagram fits a grid the same way.
Words that start SULFON
Its neighbours in the OUTLIER dictionary - shortest first.
Could you have found SULFONIUM?
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 99 - and most players walked straight past it.
Play today's OUTLIER