Of, relating to, or characteristic of the alkahest or alkahestica; pertaining to alchemical pursuits of universal solvents.
From alkahest plus -ical, a common English adjectival suffix. Used in early modern English to describe theories, experiments, or literature related to the alkahest quest.
Adding 'ical' to alkahest instead of just 'ic' made it sound even more scholarly and serious—a linguistic inflation that early modern scholars used to legitimize their wildest chemical fantasies!
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