The rare daily word game sweeping the globe. Find what's hidden in plain sight.
PROTHALLIUM
Definition of PROTHALLIUM
noun
A plant, usually a pteridophyte, in gametophyte stage in the metagenesis cycle.
Wiktionary · CC BY-SA
Where it comes from
From Latin pro (“forwards”) + Ancient Greek θᾰλλός (thăllós, “young branch, twig”).
Etymology via Wiktionary (CC BY-SA).
Word DNA
Line of descent
- Ancient Greek
- Latin
- English
2 recorded generations before English.
Deepest traced root
3rd
of 59 source languages in OUTLIER
12.3%
of traced words share this origin (10,543)
branch · 12.3% 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.
PROTHALLIUM in OUTLIER
Players have found it on 1 board so far.
It first turned up on Day 154, 21 October 2026. Nobody has seen it on a board for 18 days.
First ever to find it
on Day 154, 21 October 2026 - before anyone else in Outlier's history. See the Pioneers
Built from these letters
PROTHALLIUM starts with P and ends with M. Sorted, its letters read AHILLMOPRTU - the shape to hunt for when the grid is scrambled. L appears more than once, including a double letter.
Words that start PROTHAL
Its neighbours in the OUTLIER dictionary - shortest first.
Could you have found PROTHALLIUM?
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 154 - and most players walked straight past it.
Play today's OUTLIER