The rare daily word game sweeping the globe. Find what's hidden in plain sight.
HYDRO
Definition of HYDRO
adjective
Clipping of hydroelectric.
Wiktionary · CC BY-SA
Where it comes from
From the prefix hydro-, from Ancient Greek ὕδωρ (húdōr, “water”). By surface analysis, hydr- (“water”) + -o-. The Canadian "electricity" sense is owing to hydroelectricity being the prevalent source of electricity in much of Canada and many electric companies having the word Hydro in their names.
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.
HYDRO in OUTLIER
Players have found it on 24 boards so far. 33 players have found it across Outlier's history.
It first turned up on Day 2, 23 May 2026. The most recent board was Day 106, 3 September 2026. Nobody has seen it on a board for 3 days.
First found by a player on Day 2, 23 May 2026.
Built from these letters
HYDRO starts with H and ends with O. Sorted, its letters read DHORY - the shape to hunt for when the grid is scrambled. No letter is used twice, which makes it an isogram.
Same letters, different word
One other word uses exactly these letters. Worth knowing at the board: an anagram fits a grid the same way.
Words that start HYDRO
Its neighbours in the OUTLIER dictionary - shortest first.
Could you have found HYDRO?
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 2 - and most players walked straight past it.
Play today's OUTLIER