The rare daily word game sweeping the globe. Find what's hidden in plain sight.

ACIDIFY

/əˈsɪdɪfaɪ/7 letters

Definition of ACIDIFY

verb

To make something (more) acidic or sour; to convert into an acid.

Wiktionary · CC BY-SA

Where it comes from

From acid + -ify, from Latin acidus (“sour, acid”); compare French acidifier.

Etymology via Wiktionary (CC BY-SA).

Rarity score
Withheld
Revealed only in play
Tier
Withheld
Find it yourself

OUTLIER scores every word on how unusual it is, and that number is not published. Working it out at the board is the game.

ACIDIFY in OUTLIER

Players have found it on 15 boards so far. 24 players have found it across Outlier's history.

Day 1Day 111
Its 15 boards, across 111 finished boards · taller bars are busier boards
15
Boards found on
9
First board
108
Latest board
35
Longest gap, days

It first turned up on Day 9, 29 May 2026. The most recent board was Day 108, 5 September 2026. Nobody has seen it on a board for 3 days.

First found by a player on Day 9, 29 May 2026.

Built from these letters

ACIDIFY
7
Letters
3
Vowels
4
Consonants
6
Different letters
2
Longest consonant run
1
Longest vowel run

ACIDIFY starts with A and ends with Y. Sorted, its letters read ACDFIIY - the shape to hunt for when the grid is scrambled. I appears more than once.

Words that start ACIDIF

Its neighbours in the OUTLIER dictionary - shortest first.

ACIDIFIEDACIDIFIERACIDIFIESACIDIFIERSACIDIFYINGACIDIFIABLEACIDIFICATIONACIDIFICATIONS

Could you have found ACIDIFY?

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 9 - and most players walked straight past it.

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