Rubiginous

[ roo-bij-uh-nuhs ]

adjective

1. of a reddish-brown color, as rust
2. rusty or rusty-looking

Examples of rubiginous in a sentence:

• The rubiginous appearance of the metal pipes suggested they were old and should be replaced.
• We trekked across the hot, dry desert, our feet leaving prints in the rubiginous soil.