1) Irony 1) Refers to containing iron 
rust-colored.
rust coloured
brown red, rust colored
of the colour of rust; impregnated with iron
• (a.) Partaking of iron; containing particles of iron. • (a.) Resembling iron rust in appearance or color; brownish red, or yellowish red.
rust-colored
1. Iron-bearing; associated with or containing iron. ... 2. Of the colour of iron rust. ... Origin: L. Ferrugineus, iron rust, rust-coloured ... (05 Mar 2000) ... 
(fә-roo´jĭ-nәs) containing iron or iron rust.
rust-colored
1) Containing iron. 2) Appearing like iron. 3) Having a dull reddish-brown color similar to rust.
Fer·ru'gi·nous adjective [ Latin ferruginus , ferrugineus , from ferrugo , - ginis , iron rust: confer French ferrugineux . See Ferrugo .] 1. Partaking of iron; containing particles of iron. Boyle. 2. Resembling iron rust in appear...
Type: Term Pronunciation: fe-rū′ji-nŭs Definitions: 1. Iron-bearing; associated with or containing iron. 2. Of the color of iron rust.
brown red, rust colored
Ferruginous refers to containing iron.
Rusty-brown colour
limestone or sandstone containing a high proportion of iron oxide.