The rare daily word game sweeping the globe. Find what's hidden in plain sight.
BIOFILM
Definition of BIOFILM
noun
A structured community of microorganisms, such as bacteria, that adhere to a surface and are embedded in a self-produced protective matrix of mucuslike extracellular material.
Wiktionary · CC BY-SA
Where it comes from
From bio- + film. First used in the early 1970s in the context of wastewater treatment.
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.
BIOFILM in OUTLIER
Players have found it on 9 boards so far.
It first turned up on Day 39, 28 June 2026. The most recent board was Day 120, 17 September 2026. It was on the latest finished board.
First ever to find it
on Day 39, 28 June 2026 - before anyone else in Outlier's history. See the Pioneers
Built from these letters
BIOFILM starts with B and ends with M. Sorted, its letters read BFIILMO - the shape to hunt for when the grid is scrambled. I appears more than once.
Also seen on Day 39
Could you have found BIOFILM?
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 39 - and most players walked straight past it.
Play today's OUTLIER