The rare daily word game sweeping the globe. Find what's hidden in plain sight.
ACROLEIN
Definition of ACROLEIN
noun
A pungent, acrid, poisonous liquid aldehyde, CH2=CH-CH=O, made by the destructive distillation of glycerol.
Wiktionary · CC BY-SA
Where it comes from
Borrowed from German Acrolein, from Latin acer (“sharp”) + oleō (“smell”, verb) + -in.
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.
ACROLEIN in OUTLIER
Players have found it on 3 boards so far.
It first turned up on Day 96, 24 August 2026. The most recent board was Day 110, 7 September 2026. Nobody has seen it on a board for 1 day.
First ever to find it
on Day 96, 24 August 2026 - before anyone else in Outlier's history. See the Pioneers
Built from these letters
ACROLEIN starts with A and ends with N. Sorted, its letters read ACEILNOR - the shape to hunt for when the grid is scrambled. No letter is used twice, which makes it an isogram.
Same letters, different word
3 other words use exactly these letters. Worth knowing at the board: an anagram fits a grid the same way.
Words that start ACROLE
Its neighbours in the OUTLIER dictionary - shortest first.
Could you have found ACROLEIN?
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 96 - and most players walked straight past it.
Play today's OUTLIER