Definitions

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

  • n. A special clay containing iron and manganese oxides, used as a pigment for oil and watercolor painting.
  • n. Raw sienna.
  • n. Burnt sienna.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. a form of clay containing iron and manganese.
  • n. a pigment with a reddish-brown colour.
  • n. a light reddish-brown colour.
  • adj. having a reddish-brown colour.

from the GNU version of the Collaborative International Dictionary of English

  • n. Clay that is colored red or brown by the oxides of iron or manganese, and used as a pigment. It is used either in the raw state or burnt.

from The Century Dictionary and Cyclopedia

  • n. A ferruginous ocherous earth, fine and smooth, used as a pigment in both oil and water-color painting.
  • n. The color of sienna pigment.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an earth color containing ferric oxides; used as a pigment

Etymologies

Short for terra-sienna, from Italian terra di Sienna, earth of Siena, after Siena .
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Italian terra di Sienna, "earth of Siena", Siena being the most notable Renaissance location of the clay (Wiktionary)

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