Geology. iron-bearing: ferruginous clays.
of the color of iron rust.

1655–65; < Latin ferrūginus rust-colored, derivative of ferrūgin-, stem of ferrūgō iron-rust, derivative of ferrum iron; see -ous

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World English Dictionary
ferruginous (fɛˈruːdʒɪnəs)
1.  (of minerals, rocks, etc) containing iron: a ferruginous clay
2.  rust-coloured
[C17: from Latin ferrūgineus of a rusty colour, from ferrūgō iron rust, from ferrum iron]

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American Heritage
Medical Dictionary

ferruginous fer·ru·gi·nous (fə-rōō'jə-nəs, fě-)

  1. Associated with or containing iron.

  2. Having the color of iron rust; reddish-brown.

The American Heritage® Stedman's Medical Dictionary
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Adult ferruginous hawk has mostly white underparts with dark legs, slimmer wing silhouette.
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