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a ferruginous earth used as a yellowish-brown pigment (raw sienna) or, after roasting in a furnace, as a reddish-brown pigment (burnt sienna)
the color of such a pigment.

1750–60; < Italian (terra di) Sien(n)a (earth of) Siena

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
burnt sienna
1.  a reddish-brown dye or pigment obtained by roasting raw sienna in a furnace
2.  a dark reddish-orange to reddish-brown colour

sienna (sɪˈɛnə)
1.  a natural earth containing ferric oxide used as a yellowish-brown pigment when untreated (raw sienna) or a reddish-brown pigment when roasted (burnt sienna)
2.  See also burnt sienna the colour of this pigment
[C18: from Italian terra di Siena earth of Siena]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1760, from It. terra di Sienna "earth of Siena," city in central Italy, where the coloring material was first produced. The city name probably is from Senones, the name of a Gaulish people who settled there in ancient times.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
From burnt sienna to periwinkle, the crayons stood at attention, immaculate and pointy with possibilities.
The paint was supposed to be mixed of natural burnt sienna, applied in layers.
The cement was colored with burnt sienna and raw umber in exterior stucco to approximate the historic brick color.
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