The Collaborative International Dictionary
Ferreous
Ferreous \Fer"re*ous\, a. [L. ferreus, fr. ferrum iron. Cf.
Farrier, Ferrous.]
Partaking of, made of, or pertaining to, iron; like iron.
[Obs.]
--Sir T. Browne.
Wiktionary
ferreous
a. Containing or resembling iron.