Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Containing iron.
  • adj. Rusty.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Partaking of iron; containing particles of iron.
  • adj. Resembling iron rust in appearance or color; brownish red, or yellowish red.

from The Century Dictionary and Cyclopedia

  • Of the color of iron-rust; light reddish brown.
  • Of the nature of or containing iron.

Etymologies

From Latin ferrūginus, from ferrūgō, ferrūgin-, iron rust, from ferrum, iron.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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