Ferrotype :: Ferrotype (n.) A photographic picture taken on an iron plate by a collodion process; -- familiarly called tintype.
Ferrous :: Ferrous (a.) Pertaining to, or derived from, iron; -- especially used of compounds of iron in which the iron has its lower valence; as, ferrous sulphate..
Hydroferrocyanic :: Hydroferrocyanic (a.) Pertaining to, or containing, or obtained from, hydrogen, ferrous iron, and cyanogen; as, hydroferrocyanic acid. See Ferrocyanic..