Hydroferrocyanic

Hy`dro`fer`ro`cy`an´ic


a.1.(Chem.) Pertaining to, or containing, or obtained from, hydrogen, ferrous iron, and cyanogen; as, hydroferrocyanic acid. See Ferrocyanic.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.