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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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