A person who studies, practices, or is an expert in the Cabbala and its mystical teachings and interpretations.
From cabbala plus the agent suffix '-ist' (one who practices or studies), following the standard English pattern for naming practitioners of a discipline or philosophy.
Medieval Christian cabbalists were so committed to finding hidden meanings that they'd spend months analyzing a single word—they believed every letter, number, and position in the Torah was placed there intentionally by God, so reading between the lines (literally) was basically biblical detective work.
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