The rare daily word game sweeping the globe. Find what's hidden in plain sight.
HYDRONIUM
Definition of HYDRONIUM
noun
The hydrated hydrogen ion, H3O.
Wiktionary · CC BY-SA
Where it comes from
From hydro- + onium.
Etymology via Wiktionary (CC BY-SA).
Word DNA
How it is built
Same root, HYDRONIUM · 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.
HYDRONIUM in OUTLIER
Players have found it on 15 boards so far. 16 players have found it across Outlier's history.
It first turned up on Day 34, 23 June 2026. The most recent board was Day 167, 3 November 2026. Nobody has seen it on a board for 2 days.
First found by a player on Day 34, 23 June 2026.
Built from these letters
HYDRONIUM starts with H and ends with M. Sorted, its letters read DHIMNORUY - the shape to hunt for when the grid is scrambled. No letter is used twice, which makes it an isogram.
Words that start HYDRON
Its neighbours in the OUTLIER dictionary - shortest first.
Also seen on Day 34
Could you have found HYDRONIUM?
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 34 - and most players walked straight past it.
Play today's OUTLIER