ALKAHEST
alkahest, alcahest, universal solvent
(noun) hypothetical universal solvent once sought by alchemists
Source: WordNet® 3.1
Etymology
Noun
alkahest (plural alkahests)
(now historical) A universal solvent sought by the alchemists. [from 17th c.]
Source: Wiktionary
Al"ka*hest, n. Etym: [LL. alchahest, F. alcahest, a word that has an
Arabic appearance, but was probably arbitrarily formed by
Paracelsus.]
Definition: The fabled "universal solvent" of the alchemists; a menstruum
capable of dissolving all bodies.
– Al`ka*hes"tic, a.
Source: Webster’s Unabridged Dictionary 1913 Edition