The rare daily word game sweeping the globe. Find what's hidden in plain sight.
THIMEROSAL
Definition of THIMEROSAL
noun
US standard form of thiomersal.
THIOMERSAL
noun
A compound, chemical formula C9H9HgNaO2S, used as an antiseptic and antifungal agent, especially in vaccines.
Wiktionary · CC BY-SA
Word DNA
How it is built
OUTLIER scores every word on how unusual it is, and that number is not published. Working it out at the board is the game.
THIMEROSAL in OUTLIER
Players have found it on 9 boards so far. 14 players have found it across Outlier's history.
It first turned up on Day 13, 2 June 2026. The most recent board was Day 150, 17 October 2026. Nobody has seen it on a board for 3 days.
First ever to find it
on Day 13, 2 June 2026 - before anyone else in Outlier's history. See the Pioneers
Built from these letters
THIMEROSAL starts with T and ends with L. Sorted, its letters read AEHILMORST - the shape to hunt for when the grid is scrambled. No letter is used twice, which makes it an isogram.
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 THIMER
Its neighbours in the OUTLIER dictionary - shortest first.
Also seen on Day 13
Could you have found THIMEROSAL?
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 13 - and most players walked straight past it.
Play today's OUTLIER