The rare daily word game sweeping the globe. Find what's hidden in plain sight.
PROTIUM
Definition of PROTIUM
noun
The lightest and most common isotope of hydrogen, having a single proton and no neutrons: 11H. It is the only stable nuclide with no neutrons.
Wiktionary · CC BY-SA
Where it comes from
From proto- + -ium. From Ancient Greek πρῶτος (prôtos, “first”).
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.
PROTIUM in OUTLIER
Players have found it on 6 boards so far.
It first turned up on Day 52, 11 July 2026. The most recent board was Day 110, 7 September 2026. Nobody has seen it on a board for 1 day.
First ever to find it
on Day 52, 11 July 2026 - before anyone else in Outlier's history. See the Pioneers
Built from these letters
PROTIUM starts with P and ends with M. Sorted, its letters read IMOPRTU - the shape to hunt for when the grid is scrambled. No letter is used twice, which makes it an isogram.
Also seen on Day 52
Could you have found PROTIUM?
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 52 - and most players walked straight past it.
Play today's OUTLIER