Abracadabra

Abracadabra is an incantation used as a magic word in conjuring tricks that historically was believed to have healing powers when inscribed on an amulet.
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The first known mention of the word ABRACADABRA was in the 2nd century AD in a poem called De Medicina Praecepta by Serenus Sammonicus, physician to the Roman emperor Caracalla, who prescribed that the sufferer from the disease wear an amulet containing the word written in the form of a triangle.