| sienna | <chemistry> Clay that is coloured 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. Burnt sienna, sienna made of a much redder colour by the action of fire. Raw sienna, sienna in its natural state, of a transparent yellowish brown colour. Origin: It. Terra di Siena, fr. Siena in Italy. Source: Websters Dictionary (01 Mar 1998) |
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| sienna | an earth color containing ferric oxides |
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