The Collaborative International Dictionary of English v.0.48:

Azoth \Az"oth\, n. [LL. azoch, azoth, fr. Ar. az-zauq mercury.]
   (Alchemy)
      (a) The first principle of metals, i. e., mercury, which
          was formerly supposed to exist in all metals, and to
          be extractable from them.
      (b) The universal remedy of Paracelsus.
          [1913 Webster]