FERRUGINOUS

Etymology

Adjective

ferruginous (comparative more ferruginous, superlative most ferruginous)

Containing iron.

Rusty.

Rust-coloured.

Source: Wiktionary

Fer*ru"gi*nous, a. Etym: [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.

Source: Webster’s Unabridged Dictionary 1913 Edition