Etymology
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Sienna

city in central Italy, probably from Senones, the name of a Gaulish people who settled there in ancient times. Related: Sienese. The brownish-ochre color (1760) is from Italian terra di Sienna "earth of Siena," where the coloring material first was produced.

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Definitions of Sienna

sienna (n.)
an earth color containing ferric oxides; used as a pigment;
From wordnet.princeton.edu