Definition of ferruginous
1 : of, relating to, or containing iron a ferruginous soil
2 : resembling iron rust in color
Origin and Etymology of ferruginous
Latin ferrugineus, ferruginus, from ferrugin-, ferrugo iron rust, from ferrum
First Known Use: circa 1661
Seen and Heard
What made you want to look up ferruginous? Please tell us where you read or heard it (including the quote, if possible).