Abracadabra
late 17th century (as a mystical word engraved and used as a charm to ward off illness): from Latin, first recorded in a 2nd-century poem by Q. Serenus Sammonicus, from a Greek base.
wiktionary
From Late Latin abracadabra, a word used in magical writings, of unknown origin. Relationships have been suggested with Abraxas(a Gnostic deity), and with various Aramaic or Hebrew terms עברא כדברא (avra kedavra, literally “what was said has come to pass”), עַבְדָא כְּדַברָא (avda kedavara, literally “what was said has been done”); ארבע-אחד-ארבע (arba-eḥad-arba, literally “four-one-four”), [1] but there is little supporting evidence.
etymonline
abracadabra
magical formula, 1690s, from Latin (Q. Serenus Sammonicus, 2c.), from Late Greek Abraxas, cabalistic or gnostic name for the supreme god, and thus a word of power. It was written out in a triangle shape and worn around the neck to ward off sickness, etc. Another magical word, from a mid-15c. writing, was ananizapta.
