This study presents a comprehensive philological, historical-religious, and comparative Semitic analysis of the expression "abracadabra," one of the most recognizable ritual formulas in the history of Western civilization. Although today primarily associated with stage magic and popular culture, the term originally functioned within a late antique apotropaic and medicomagical context. The earliest securely attested occurrence appears in the Liber Medicinalis of Quintus Serenus Sammonicus, where the formula is written in a progressively diminishing triangular form intended to symbolize the disappearance of disease. broader Semitic conceptions concerning the creative and transformative power of speech, naming, and textual action.