The rare daily word game sweeping the globe. Find what's hidden in plain sight.
BIOSTROME
Definition of BIOSTROME
noun
A horizontally bedded stratum of fossilized remains of sedentary organisms
Wiktionary · CC BY-SA
Where it comes from
bio- (“life”) + Latin stroma (“coverlet”), from Ancient Greek στρῶμα (strôma, “bed, mattress”).
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.
BIOSTROME in OUTLIER
Players have found it on 2 boards so far.
It first turned up on Day 68, 27 July 2026. The most recent board was Day 72, 31 July 2026. Nobody has seen it on a board for 30 days.
First ever to find it
on Day 68, 27 July 2026 - before anyone else in Outlier's history. See the Pioneers
Built from these letters
BIOSTROME starts with B and ends with E. Sorted, its letters read BEIMOORST - the shape to hunt for when the grid is scrambled. O 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 BIOSTR
Its neighbours in the OUTLIER dictionary - shortest first.
Could you have found BIOSTROME?
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 68 - and most players walked straight past it.
Play today's OUTLIER