Source : Webster's Revised Unabridged Dictionary (1913)

Hydroferrocyanic \Hy`dro*fer`ro*cy*an"ic\, a. [Hydro-, 2 +
   ferrocyanic.] (Chem.)
   Pertaining to, or containing, or obtained from, hydrogen,
   ferrous iron, and cyanogen; as, hydroferrocyanic acid. See
   {Ferrocyanic}.