ferruginous

adj.

1. Of, containing, or similar to iron.
2. Having the color of iron rust; reddish-brown.

[From Latin ferrūginus, from ferrūgō, ferrūgin-, iron rust, from ferrum, iron.]

Of or containing iron or iron rust. A ferruginous soil is a zonal soil developed in warm temperate climates without a dry season, or in the tropical savanna or bushlands. These soils develop to a great depth because of the intensity of tropical weathering. The A horizon is a dark red-brown with a weak crumbling structure. The B horizon is stained red by the ferruginous gravel present. In US soil classification, a ferruginous soil is an ultisol.

Containing iron; such rocks indicate the presence of iron by reddish-brown stains.

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(fə-rū'jə-nəs, fĕ-)
adj.

1. Associated with or containing iron.
2. Having the color of iron rust; reddish-brown.

[fr. L. ferrugo, iron rust]  /feh-RU-ji-nous/
1) originally, of the nature of iron rust; now commonly, of the nature of iron
2) rust-colored; reddish-brown