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sienna

sienna

1 definition found

The Collaborative International Dictionary of English v.0.48 [gcide]:
  Sienna \Si*en"na\, n. [It. terra di Siena, fr. Siena in Italy.]
     (Chem.)
     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]

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