A person who practices alchemy; a medieval scholar or experimenter who attempts to transform materials through magical or chemical means.
From alchemy + -ister (an agent suffix). The suffix -ster was used in Middle English and Old English for practitioners of a craft, similar to 'minister' or 'magister' (master).
Unlike 'alchemist' (the standard form), 'alchemister' is a rare variant that emphasizes the person as a skilled practitioner or master—it's the kind of word medieval scholars might have actually used when they took themselves very seriously.
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