The rare daily word game sweeping the globe. Find what's hidden in plain sight.
CASTOREUMS
Definition of CASTOREUMS
noun
plural of castoreum
noun
The bitter exudate of the castor sacs of mature beavers, used as a scent mark, and as a tincture in some perfumes.
Wiktionary · CC BY-SA
Word DNA
CASTOREUMS inherits its ancestry from its root, CASTOREUM.
Line of descent
- Ancient Greek
- Latin
- English
2 recorded generations before English.
Deepest traced root
2nd
of 58 source languages in OUTLIER
12.6%
of traced words share this origin (3,666)
branch · 12.6% of traced words
How it is built
Same root, CASTOREUM · 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.
CASTOREUMS in OUTLIER
Players have found it on 1 board so far.
It first turned up on Day 140, 7 October 2026. Nobody has seen it on a board for 6 days.
First ever to find it
on Day 140, 7 October 2026 - before anyone else in Outlier's history. See the Pioneers
Built from these letters
CASTOREUMS starts with C and ends with S. Sorted, its letters read ACEMORSSTU - the shape to hunt for when the grid is scrambled. S appears more than once.
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 CASTOR
Its neighbours in the OUTLIER dictionary - shortest first.
Could you have found CASTOREUMS?
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 140 - and most players walked straight past it.
Play today's OUTLIER