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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

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

Century Dictionary and Cyclopedia

  1. n. A ferruginous ocherous earth, fine and smooth, used as a pigment in both oil and water-color painting. The finest is that obtained from Italy. Raw sienna is the native pigment prepared by simply drying the material which is taken from the mine or vein and afterward powdering. In composition and appearance it somewhat resembles yellow ocher, but it is deeper in tint and of a browner hue. It gives a highly chromatic orange-yellow, considerably darkened, its luminosity being about half that of a bright chrome-yellow. Its transparency is one of its important qualities, while opacity should be the characteristic of an ocher. Burnt sienna is the raw material roasted in a furnace before powdering. By this means the color is changed to a warm reddish brown similar to old mahogany. It is, like raw sienna, translucent in body.
  2. n. The color of sienna pigment.

Wiktionary

  1. n. a form of clay containing iron and manganese.
  2. n. a pigment with a reddish-brown colour.
  3. n. a light reddish-brown colour.
  4. adj. having a reddish-brown colour.

GNU Webster's 1913

  1. n. (Chem.) 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.

WordNet 3.0

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

Etymologies

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

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‘sienna’ has been looked up 1920 times, loved by 1 person, added to 30 lists, and has a Scrabble score of 6.