divine name · c. 200 CE
Abracadabra
A word written as a shrinking triangle, one letter dropped per line, so that the fever it is written against diminishes with it.
What the sources claim for it
Diminution, performed on parchment so that the disease copies it.
What is it made of?
Not a word so much as a shape made out of one: written in full on the top line, then a letter shorter on each line below, until nothing is left.
Line one
11 letters
Each line after
one letter fewer
Last line
one letter
Abracadabra
- 01
Line one · 11 letters — The full word, written as an inscription rather than spoken.
- 02
Each line after · one letter fewer — The diminishing is the operation. Serenus Sammonicus prescribes it in the third century for tertian fever.
- 03
Last line · one letter — The fever is supposed to dwindle as the word does — sympathetic logic, written down and worn at the neck.
History
Where does Abracadabra come from?
The earliest description is medical. Serenus Sammonicus, physician to Caracalla, prescribes writing the word on a piece of linen in a diminishing triangle — ABRACADABRA, ABRACADABR, ABRACADAB, down to a single A — and wearing it at the neck against a recurrent fever.
The mechanism is sympathetic and completely explicit: the word wastes away on the page and the illness is to follow it. That makes it one of the clearest statements of how these objects were understood to work, from a source with no interest in mystification — a doctor writing a verse handbook of remedies.
The larger argument
Why is it in a corpus about spirits?
One of the few places in the corpus where the mechanism is legible without any theology at all: the shape of the writing is the argument. It is also the ancestor of every stage-magic 'abracadabra', which is a reception story of exactly the same kind as the seals — the equipment survives, the claim it was making does not.
Afterwards
What did it turn into?
Reduced to a stage-magician's word by the nineteenth century, and now the English-speaking world's default nonsense-incantation, with the triangle and the fever both forgotten.
Which texts describe it?
None, and here is why
Waiting on a single short text. The triangular arrangement is prescribed in the Liber Medicinalis of Serenus Sammonicus, around the beginning of the third century, which is the earliest known appearance and is out of copyright. It is not in the corpus yet.
Nearby
Related marks
The Pentagram
A five-pointed star drawn in one unbroken line — an accounting mark, a Pythagorean password, a Christian emblem of the five wounds, and only recently a sign of evil.
The Sator Square
Five Latin words in a grid that reads the same in four directions, scratched on a wall at Pompeii and still being cut into churches a thousand years later.
The Circle
A drawn boundary with names written into it — the oldest continuously used device in the Western operative tradition, and the one that defines everything else on the floor.
AGLA
An acronym, not a word: Atah Gibor Le-olam Adonai, 'Thou art mighty forever, Lord', compressed to four letters and written on almost everything.
Witch Marks
Compass-drawn flowers, interlocking Vs and burn marks scratched into beams beside doors, windows and hearths in ordinary English buildings — protection with no text and no clergy attached.
The Sigil of Baphomet
An inverted pentagram, a goat's head fitted inside it, and the Hebrew letters of Leviathan around the rim — three separate nineteenth- and twentieth-century additions, presented as one ancient mark.