sienna definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
- an earth pigment containing iron and manganese oxides, yellowish-brown in the natural state and reddish-brown when burnt
- either of these colors
Origin: Italian terra di Siena, literally , earth of Siena, where first obtained
sienna definition by American Heritage Dictionary
- 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.