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alkahest (n.)

"universal solvent sought by alchemists," 1640s, from French alcahest, from Medieval Latin alcahest, a pseudo-Arabic word coined by Paracelsus (compare alchemy).

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Definitions of alkahest from WordNet

alkahest (n.)
hypothetical universal solvent once sought by alchemists;
Synonyms: alcahest / universal solvent
From wordnet.princeton.edu