| 单词 | sienna | 
| 释义 | Word Frequency sienna(sɪˈɛnə) noun 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.  the colour of this pigment   See also burnt sienna  Word origin C18: from Italian terra di Siena earth of Siena | 
	
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