The rare daily word game sweeping the globe. Find what's hidden in plain sight.
SIGMOID
Definition of SIGMOID
adjective
Semi-circular, like the uncial or lunate sigma (similar to English C).
Wiktionary · CC BY-SA
Where it comes from
Borrowing from Ancient Greek σῑγμοειδής (sīgmoeidḗs, “of the shape of sigma”), from σῖγμᾰ (sîgmă, “sigma”) + -ο- (-o-) + -ειδής (-eidḗs, “-oid, -like”); Equivalent to sigma + -oid. Compare with French sigmoïde.
Etymology via Wiktionary (CC BY-SA).
Word DNA
Line of descent
- Ancient Greek
- English
One recorded step before English.
Deepest traced root
3rd
of 59 source languages in OUTLIER
12.2%
of traced words share this origin (9,569)
branch · 12.2% of traced words
How it is built
Same root, SIGMOID · 2 relatives in the game
Its etymology also names French.
OUTLIER scores every word on how unusual it is, and that number is not published. Working it out at the board is the game.
SIGMOID in OUTLIER
Players have found it on 47 boards so far. 144 players have found it across Outlier's history.
It first turned up on Day 19, 8 June 2026. The most recent board was Day 157, 24 October 2026. Nobody has seen it on a board for 2 days.
First ever to find it
on Day 19, 8 June 2026 - before anyone else in Outlier's history. See the Pioneers
Built from these letters
SIGMOID starts with S and ends with D. Sorted, its letters read DGIIMOS - the shape to hunt for when the grid is scrambled. I appears more than once.
Words that start SIGMOI
Its neighbours in the OUTLIER dictionary - shortest first.
Also seen on Day 19
Could you have found SIGMOID?
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 19 - and most players walked straight past it.
Play today's OUTLIER