The rare daily word game sweeping the globe. Find what's hidden in plain sight.
MESOTRON
Definition of MESOTRON
noun
meson
Wiktionary · CC BY-SA
Where it comes from
From meso- + -tron. Coined by American physicists Carl Anderson and Seth Neddermeyer in 1938 in a letter to Nature titled "Mesotron (Intermediate Particle) as a Name for the New Particles of Intermediate Mass".
Etymology via Wiktionary (CC BY-SA).
Word DNA
How it is built
OUTLIER scores every word on how unusual it is, and that number is not published. Working it out at the board is the game.
MESOTRON in OUTLIER
Players have found it on 3 boards so far.
It first turned up on Day 72, 31 July 2026. The most recent board was Day 147, 14 October 2026. Nobody has seen it on a board for 12 days.
First ever to find it
on Day 129, 26 September 2026 - before anyone else in Outlier's history. See the Pioneers
Built from these letters
MESOTRON starts with M and ends with N. Sorted, its letters read EMNOORST - 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 MESOTR
Its neighbours in the OUTLIER dictionary - shortest first.
Could you have found MESOTRON?
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 72 - and most players walked straight past it.
Play today's OUTLIER