Definition of alkahest in English:

alkahest

Syllabification: al·ka·hest
Pronunciation: /ˈalkəˌhest
 
/
(also alcahest)

noun

historical
  • The hypothetical universal solvent sought by alchemists.
    More example sentences
    • The philosopher's stone, the alcahest and the elixir were names of one and the same thing, and were supposed to accomplish an identical operation.
    • Alizarin is an orange or red crystalline compound and alkahest is the universal solvent believed by alchemists to exist.
    • A paradox involving alkahest is that, if it dissolves everything, then it cannot be placed into a container, because it would dissolve the container.

Origin

mid 17th century: sham Arabic, probably invented by Paracelsus.

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