The rare daily word game sweeping the globe. Find what's hidden in plain sight.
CARDIOID
Definition of CARDIOID
noun
An epicycloid with exactly one cusp; the plane curve with polar equation ρ=1+cosθ - approximately heart-shaped
Wiktionary · CC BY-SA
Where it comes from
By surface analysis, cardi- + -oid.
Etymology via Wiktionary (CC BY-SA).
Word DNA
How it is built
Same root, CARDIOID · 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.
CARDIOID in OUTLIER
Players have found it on 1 board so far.
It first turned up on Day 134, 1 October 2026. Nobody has seen it on a board for 4 days.
First ever to find it
on Day 134, 1 October 2026 - before anyone else in Outlier's history. See the Pioneers
Built from these letters
CARDIOID starts with C and ends with D. Sorted, its letters read ACDDIIOR - the shape to hunt for when the grid is scrambled. D and I appear more than once.
Words that start CARDIO
Its neighbours in the OUTLIER dictionary - shortest first.
Could you have found CARDIOID?
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 134 - and most players walked straight past it.
Play today's OUTLIER