Abracadabra

The magic word.

The word originated from Aramaic.
The original meaning was "I will create, as I say," while the latter was "What was said has been done."

The original Aramaic was either עַבְדָא כְּדַברָא, avda kedavra, which means, "what was said has been done," or עברא כדברא, avra kedavra, which means "what was said has come to pass" or "caused to perish like the word" or "I will create what is told."

Over time, it was corrupted to its current pronunciation with the replacement of both "v" sounds with "b" sounds: b and v can be interchangeable in Aramaic.

Originally it was an incantation to be used as a cure for fevers and inflammations.

It was prescribed that the sufferer from the disease wear an amulet containing the word written in the form of an inverted cone:

A - B - R - A - C - A - D - A - B - R - A
A - B - R - A - C - A - D - A - B - R
A - B - R - A - C - A - D - A - B
A - B - R - A - C - A - D - A
A - B - R - A - C - A - D
A - B - R - A - C - A
A - B - R - A - C
A - B - R - A
A - B - R
A - B
A


(which hasn't come out right on this post!)