Abracadabra is an incantation used as a magic word in stage magic tricks, and historically was believed to have healing powers when inscribed on an amulet.
The word may have its origin in the Aramaic language, but numerous conflicting folk etymologies are associated with it.
The word Abracadabra may derive from an Aramaic phrase meaning "I create as I speak." or from the Greek "Αύρα κατ' αύρα" meaning "from Αura to Aura". This etymology is dubious, however, as אברא כדברא in Aramaic is more reasonably translated "I create like the word." In the Hebrew language, אברא translates as "I will create" and כדברא "as spoken". The second lexeme in this supposedly Aramaic phrase might be a noun given the presence of the definite article on the end of the word (it cannot be an infinitive construct, as the infinitive cannot take the definite article). Regardless, this phrase would actually be pronounced ebra kidbara, which is clearly different from abracadabra.
"[A]bracadabra may comprise the abbreviated forms of the Hebrew words Ab (Father), Ben (Son) and Ruach A Cadsch (Holy Spirit), though an alternative derivation relates the word to Abraxas, a god with snakes for feet who was worshipped in Alexandria in pre-Christian times." David Pickering's description of the word as an abbreviation from Hebrew is also a false etymology—as he apparently here means Aramaic (בר is Aramaic for "son", it is בן in Hebrew, although בר is an honorific form), nor does he account for the final five letters (i.e., -dabra) in the lexeme.
Abra Kadabra is a supervillain in the DC Comics universe and an enemy of the Flash. He first appeared in Flash #128 (May 1962) and was created by John Broome and Carmine Infantino.
Abra Kadabra is from the 64th century, at a time when science has made stage magic obsolete. However, he desires a career as a performing magician, so he goes back in time to find an audience to entertain after stealing a time machine and inventing a device to paralyze the guards, and soon clashes with the Flash (Barry Allen). He has a hypnotic device that makes people clap regardless of their thoughts, which he uses to force applause from audiences even when they don't applaud his magic tricks. He finds his magic is being overlooked, so decides to involve himself in important events. When the Flash tries to stop a crime he is committing, he makes the Flash clap, enabling him to escape. He is able to send the Flash into space after challenging him to a fight at the theatre, but the Flash is able to change the course of the planetoid he is on so he is sent back to Earth, and finds Kadabra took his left-behind costume, meaning he can follow the impulses, and Kadabra is jailed. But he hypnotizes the Governor using a ray from a device made out of pots and pans, to let him out, and starts staging a puppet show where the Flash is defeated by a puppet called Captain Cream-Puff. When the Flash passes a poster advertising Kadabra, he is turned into a puppet and used in the performance. But the Scarlet Speedster is able to restore himself slightly using the organic matter in his brain, which was not transformed, and then reverse Kadabra's ray so he is restored completely. He again defeats Kadabra.