Source : Webster's Revised Unabridged Dictionary (1913)

Prussiate \Prus"si*ate\, n. [Cf. F. prussiate.] (Chem.)
   A salt of prussic acid; a cyanide.

   {Red prussiate of potash}. See {Potassium ferricyanide},
      under {Ferricyanide}.

   {Yellow prussiate of potash}. See {Potassium ferrocyanide},
      under {Ferrocyanide}.

Source : WordNet®

yellow prussiate of potash
     n : a cyanide comound that is prepared by the reaction of
         potassium cyanide with ferrous salts; commonly used by
         gardeners [syn: {potassium ferrocyanide}]