The rare daily word game sweeping the globe. Find what's hidden in plain sight.
ANTISERUM
Definition of ANTISERUM
noun
A serum prepared from human or animal sources containing antibodies able to counter certain diseases or toxins.
Wiktionary · CC BY-SA
Where it comes from
From anti- + serum.
Etymology via Wiktionary (CC BY-SA).
Word DNA
How it is built
Same root, ANTISERUM · 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.
ANTISERUM in OUTLIER
Players have found it on 14 boards so far. 14 players have found it across Outlier's history.
It first turned up on Day 27, 16 June 2026. The most recent board was Day 147, 14 October 2026. Nobody has seen it on a board for 7 days.
First ever to find it
on Day 27, 16 June 2026 - before anyone else in Outlier's history. See the Pioneers
Built from these letters
ANTISERUM starts with A and ends with M. Sorted, its letters read AEIMNRSTU - the shape to hunt for when the grid is scrambled. No letter is used twice, which makes it an isogram.
Same letters, different word
2 other words use exactly these letters. Worth knowing at the board: an anagram fits a grid the same way.
Words that start ANTISE
Its neighbours in the OUTLIER dictionary - shortest first.
Also seen on Day 27
Could you have found ANTISERUM?
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 27 - and most players walked straight past it.
Play today's OUTLIER