- an earth pigment containing iron and manganese oxides, yellowish-brown in the natural state and reddish-brown when burnt
- either of these colors
Origin: It terra di Siena, lit., earth of Siena, where first obtained
Used by arrangement with John Wiley & Sons, Inc.
- A special clay containing iron and manganese oxides, used as a pigment for oil and watercolor painting.
- a. Raw sienna.b. Burnt sienna.
Origin: Short for terra-sienna, from Italian terra di Sienna, earth of Siena, after Siena.