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2 definitions found
 for Sienna
From The Collaborative International Dictionary of English v.0.48 :

  Sienna \Si*en"na\, n. [It. terra di Siena, fr. Siena in Italy.]
     Clay that is colored 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.
     [1913 Webster]
     Burnt sienna, sienna made of a much redder color by the
        action of fire.
     Raw sienna, sienna in its natural state, of a transparent
        yellowish brown color.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

      n 1: an earth color containing ferric oxides; used as a pigment

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