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.