The rare daily word game sweeping the globe. Find what's hidden in plain sight.
RADIOACTIVE
Definition of RADIOACTIVE
adjective
Exhibiting radioactivity.
Wiktionary · CC BY-SA
Where it comes from
Coined by Pierre Curie and Marie Curie in 1898 as French radio-actif, equivalent to English radio- + active.
Etymology via Wiktionary (CC BY-SA).
Word DNA
Line of descent
- French
- English
One recorded step before English.
Deepest traced root
5th
of 58 source languages in OUTLIER
7.2%
of traced words share this origin (2,108)
branch · 15.4% of traced words
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.
RADIOACTIVE in OUTLIER
Players have found it on 31 boards so far. 59 players have found it across Outlier's history.
It first turned up on Day 8, 29 May 2026. The most recent board was Day 143, 10 October 2026. Nobody has seen it on a board for 5 days.
First found by a player on Day 8, 29 May 2026.
Built from these letters
RADIOACTIVE starts with R and ends with E. Sorted, its letters read AACDEIIORTV - the shape to hunt for when the grid is scrambled. A and I appear more than once.
Words that start RADIOAC
Its neighbours in the OUTLIER dictionary - shortest first.
Also seen on Day 8
Could you have found RADIOACTIVE?
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 8 - and most players walked straight past it.
Play today's OUTLIER