n. (obsolete) A ferricyanide, ferrocyanide or cyanide
the GNU version of the Collaborative International Dictionary of English
n. A salt of prussic acid; a cyanide.
The Century Dictionary and Cyclopedia
n. A common name for the ferrocyanides and ferricyanides: thus, potassium ferrocyanide is commonly called yellow prussiate of potash, potassium ferricyanide red prussiate of potash, etc.
Word Usage
"The remaining solution is the coppering solution; should it not be convenient to separate the yellow prussiate by crystallization, the presence of that salt in the solution does not deteriorate it nor interfere with its power of depositing copper."