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Definition of sienna noun from the Oxford Advanced American Dictionary

 

sienna

 noun
noun
NAmE//siˈɛnə//
 
[uncountable]
 
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a type of dark yellow or red clay used for giving color to paints, etc. Burnt sienna, with its rich luminous red, makes an ideal color for adding warmth to natural brick.
See the Oxford Advanced Learner's Dictionary entry: sienna

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