The rare daily word game sweeping the globe. Find what's hidden in plain sight.
FLUORESCEIN
Definition of FLUORESCEIN
noun
Any of a class of yellow xanthene dyes which are visible when highly diluted; used forensically to detect traces of blood, and in analytical chemistry as an indicator in silver nitrate titrations
Wiktionary · CC BY-SA
Where it comes from
From fluoresce + -in.
Etymology via Wiktionary (CC BY-SA).
Word DNA
How it is built
Same root, FLUORESCEIN · 1 relative 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.
FLUORESCEIN in OUTLIER
Players have found it on 11 boards so far. 18 players have found it across Outlier's history.
It first turned up on Day 36, 25 June 2026. The most recent board was Day 120, 17 September 2026. Nobody has seen it on a board for 27 days.
First ever to find it
on Day 36, 25 June 2026 - before anyone else in Outlier's history. See the Pioneers
Built from these letters
FLUORESCEIN starts with F and ends with N. Sorted, its letters read CEEFILNORSU - the shape to hunt for when the grid is scrambled. E appears more than once.
Words that start FLUORES
Its neighbours in the OUTLIER dictionary - shortest first.
Also seen on Day 36
Could you have found FLUORESCEIN?
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 36 - and most players walked straight past it.
Play today's OUTLIER