The rare daily word game sweeping the globe. Find what's hidden in plain sight.
THECA
Definition of THECA
noun
Any of several external cases or sheaths. The pollen-producing organ usually found in pairs and forming an anther. The theca folliculi: the twin layers of cells surrounding the basal lamina of an ovarian follicle. The thecal sac: the portion of the dura mater that surrounds the spinal cord and the cauda equina. The membrane complex enveloping the cells of certain plankton including diatoms and dinoflagellates. The calcareous wall of a corallite, the exoskeleton of a coral polyp. A sporangium: a spore case.
Wiktionary · CC BY-SA
Where it comes from
From New Latin, from Latin thēca, from Ancient Greek θήκη (thḗkē, “a case, box, receptacle”), from τίθημι (títhēmi, “put, set, place”). Doublet of tay.
Etymology via Wiktionary (CC BY-SA).
OUTLIER scores every word on how unusual it is, and that number is not published. Working it out at the board is the game.
THECA in OUTLIER
Players have found it on 7 boards so far.
It first turned up on Day 20, 9 June 2026. The most recent board was Day 106, 3 September 2026. Nobody has seen it on a board for 5 days.
First ever to find it
on Day 20, 9 June 2026 - before anyone else in Outlier's history. See the Pioneers
Also on
Built from these letters
THECA starts with T and ends with A. Sorted, its letters read ACEHT - the shape to hunt for when the grid is scrambled. No letter is used twice, which makes it an isogram.
Same letters, different word
3 other words use exactly these letters. Worth knowing at the board: an anagram fits a grid the same way.
Also seen on Day 20
Could you have found THECA?
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 20 - and most players walked straight past it.
Play today's OUTLIER