Hypertext Webster Gateway: "Sienna"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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.
{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.
From WordNet (r) 1.7 (wn)
sienna
n : an earth color containing ferric oxides; used as a pigment
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