The rare daily word game sweeping the globe. Find what's hidden in plain sight.
RADON
Definition of RADON
noun
The chemical element (symbol Rn, formerly Ro) with atomic number 86. It is an odorless, colorless, chemically inert but radioactive noble gas. An atom of this element.
Wiktionary · CC BY-SA
Where it comes from
Contraction of radium emanation, since the element appears in the radioactive decay of radium. By surface analysis, radio- + -on (“suffix for noble gases”).
Etymology via Wiktionary (CC BY-SA).
Word DNA
How it is built
Same root, RADON · 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.
RADON in OUTLIER
Players have found it on 57 boards so far. 100 players have found it across Outlier's history.
It first turned up on Day 32, 21 June 2026. The most recent board was Day 158, 25 October 2026. It was on the latest finished board.
First ever to find it
on Day 32, 21 June 2026 - before anyone else in Outlier's history. See the Pioneers
Built from these letters
RADON starts with R and ends with N. Sorted, its letters read ADNOR - the shape to hunt for when the grid is scrambled. No letter is used twice, which makes it an isogram.
Same letters, different word
3 other words use exactly these letters. Worth knowing at the board: an anagram fits a grid the same way.
Also seen on Day 32
Could you have found RADON?
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 32 - and most players walked straight past it.
Play today's OUTLIER