Fer*ru"gi*nous (?), a. [L. ferruginus, ferrugineus, fr. ferrugo, -ginis, iron rust: cf. F. ferrugineux. See Ferrugo.]
1.
Partaking of iron; containing particles of iron.
Boyle.
2.
Resembling iron rust in appearance or color; brownish red, or yellowish red.
© Webster 1913.