Where did “Abracadabra” come from?

The word “abracadabra ” first appears in Liber Medicinalis (known as De Medicina Praecepta Saluberrima), a medical book written in verse in Latin. It is believed that the author could have been Quintus Serenus Sammonicus, a court scholar of Emperor Septimius Severus (ruled 193-211 CE) and Caracalla (209-217 CE). In chapter 51 the author recommends that people suffering from malaria wear an amulet containing the said word in the form of a triangle:

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

The strength of the amulet was to reverse a deadly disease and heal the sick. After the death of Serenus Sammonicus in December 212 CE the spell was still used in the Roman Empire; incl. he himself wore the amulet Alexander Severus.

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