The rare daily word game sweeping the globe. Find what's hidden in plain sight.
HYPOCAUST
Definition of HYPOCAUST
noun
An underfloor space or flue through which heat from a furnace passes to heat the floor of a room or a bath.
Wiktionary · CC BY-SA
Where it comes from
From Latin hypocaustum, from Ancient Greek ὑπόκαυστον (hupókauston), from Ancient Greek ὑπό (hupó, “underneath”) + καυστόν (kaustón, “burnt offering”).
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.
HYPOCAUST in OUTLIER
Players have found it on 21 boards so far. 30 players have found it across Outlier's history.
It first turned up on Day 31, 20 June 2026. The most recent board was Day 102, 30 August 2026. It was on the latest finished board.
First ever to find it
on Day 31, 20 June 2026 - before anyone else in Outlier's history. See the Pioneers
Built from these letters
HYPOCAUST starts with H and ends with T. Sorted, its letters read ACHOPSTUY - the shape to hunt for when the grid is scrambled. No letter is used twice, which makes it an isogram.
Words that start HYPOCA
Its neighbours in the OUTLIER dictionary - shortest first.
Also seen on Day 31
Could you have found HYPOCAUST?
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 31 - and most players walked straight past it.
Play today's OUTLIER