Alcahest

.
the universal solvent sought by the alchemists.
historical examples

the alcahest was his celebrated universal medicine, and was considered the greatest mystery of all.
the mystery and romance of alchemy and pharmacy charles john samuel thompson

it was then placed in a dish and set on fire, and the residue that remained was the alcahest.
the mystery and romance of alchemy and pharmacy charles john samuel thompson

alkahest, alcahest, al′ka-hest, n. the universal solvent of the alchemists.
chambers’s twentieth century dictionary (part 1 of 4: a-d) various

alchemy furnishes the theme for one tale; the protagonist seeks an alcahest, a human victim for his crucible.
the merry-go-round carl van vechten

noun
a variant spelling of alkahest
noun
the hypothetical universal solvent sought by alchemists
n.

“universal solvent sought by alchemists,” 1640s, from french alcahest, from medieval latin alcahest, a pseudo-arabic word coined by paracelsus (see alchemy).

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