Pol″y‐chrest (?), n. [Gr. � useful for many purposes; πολύσ many + � useful, fr. � to use: cf. F. polychreste.] (Med.) A medicine that serves for many uses, or that cures many diseases.
Polychrest salt(Old Med. Chem.), potassium sulphate, specifically obtained by fusing niter with sulphur.