alkahest
Concise Oxford English Dictionary © 2008 Oxford University Press:
alkahest /ˈalkəhɛst/ (also alcahest)
▶noun historical the hypothetical universal solvent sought by alchemists.
– origin C17: sham Arab., prob. invented by the 16th-cent. Swiss physician Paracelsus.
'alkahest' also found in these Oxford entries:

