polychrest

n. [ Gr. &unr_; useful for many purposes; poly`s many + &unr_; useful, fr. &unr_; to use: cf. F. polychreste. ] (Med.) A medicine that serves for many uses, or that cures many diseases. [ Obs. ] [ 1913 Webster ]

Polychrest salt (Old Med. Chem.), potassium sulphate, specifically obtained by fusing niter with sulphur. [ 1913 Webster ]