The rare daily word game sweeping the globe. Find what's hidden in plain sight.
MUON
Definition of MUON
noun
An unstable elementary particle in the lepton family, having similar properties to the electron but with a mass 207 times greater.
Wiktionary · CC BY-SA
Where it comes from
Contraction of the earlier term mu-meson; the particle has now been recategorised as a lepton. Coined by Italian physicist Enrico Fermi in 1951 in his book Elementary Particles.
Etymology via Wiktionary (CC BY-SA).
Word DNA
Line of descent
- Italian
- English
One recorded step before English.
Deepest traced root
10th
of 59 source languages in OUTLIER
1.7%
of traced words share this origin (1,301)
branch · 12.9% of traced words
How it is built
Same root, MUON · 2 relatives 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.
MUON in OUTLIER
Players have found it on 69 boards so far. 167 players have found it across Outlier's history.
It first turned up on Day 27, 16 June 2026. The most recent board was Day 158, 25 October 2026. It was on the latest finished board.
First found by a player on Day 27, 16 June 2026.
Built from these letters
MUON starts with M and ends with N. Sorted, its letters read MNOU - the shape to hunt for when the grid is scrambled. No letter is used twice, which makes it an isogram.
Words that start MUON
Its neighbours in the OUTLIER dictionary - shortest first.
Also seen on Day 27
Could you have found MUON?
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 27 - and most players walked straight past it.
Play today's OUTLIER