Source : Webster's Revised Unabridged Dictionary (1913)

Alchemist \Al"che*mist\, n. [Cf. OF. alquemiste, F. alchimiste.]
   One who practices alchemy.

         You are alchemist; make gold.            --Shak.

Source : WordNet®

alchemist
     n : one who was versed in the practice of alchemy and who sought
         an elixir of life and a panacea and an alkahest and the
         philosopher's stone