The rare daily word game sweeping the globe. Find what's hidden in plain sight.
MASTOID
Definition of MASTOID
adjective
Being the process of the temporal bone behind the ear. Being any of several bony elements that occupy a similar position in the skull of lower vertebrates.
Wiktionary · CC BY-SA
Where it comes from
Borrowed from New Latin mastoīdēs, from Ancient Greek μᾰστοειδής (măstoeidḗs, “like a breast”), from μᾰστός (măstós, “a woman's breast”) + -ειδής (-eidḗs, “-like, -oid”).
Etymology via Wiktionary (CC BY-SA).
Word DNA
Line of descent
- Ancient Greek
- Latin
- English
2 recorded generations before English.
Deepest traced root
2nd
of 59 source languages in OUTLIER
12.7%
of traced words share this origin (3,854)
branch · 12.7% of traced words
How it is built
OUTLIER scores every word on how unusual it is, and that number is not published. Working it out at the board is the game.
MASTOID in OUTLIER
Players have found it on 45 boards so far. 92 players have found it across Outlier's history.
It first turned up on Day 28, 17 June 2026. The most recent board was Day 152, 19 October 2026. Nobody has seen it on a board for 2 days.
First found by a player on Day 28, 17 June 2026.
Built from these letters
MASTOID starts with M and ends with D. Sorted, its letters read ADIMOST - 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 MASTOI
Its neighbours in the OUTLIER dictionary - shortest first.
Also seen on Day 28
Could you have found MASTOID?
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 28 - and most players walked straight past it.
Play today's OUTLIER