The rare daily word game sweeping the globe. Find what's hidden in plain sight.
DEUTERIUM
Definition of DEUTERIUM
noun
An isotope of hydrogen with one proton and one neutron in each atom - 21H.
Wiktionary · CC BY-SA
Where it comes from
From deutero- + -ium. Coined by American physical chemist Harold Urey, from Ancient Greek δεύτερος (deúteros, “second”).
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.
DEUTERIUM in OUTLIER
Players have found it on 19 boards so far. 57 players have found it across Outlier's history.
It first turned up on Day 19, 8 June 2026. The most recent board was Day 101, 29 August 2026. Nobody has seen it on a board for 1 day.
First ever to find it
on Day 19, 8 June 2026 - before anyone else in Outlier's history. See the Pioneers
Built from these letters
DEUTERIUM starts with D and ends with M. Sorted, its letters read DEEIMRTUU - the shape to hunt for when the grid is scrambled. E and U appear more than once.
Words that start DEUTER
Its neighbours in the OUTLIER dictionary - shortest first.
Also seen on Day 19
Could you have found DEUTERIUM?
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 19 - and most players walked straight past it.
Play today's OUTLIER