sienna

2 definitions found

sienna - Collaborative International Dictionary of English v.0.48 :

  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]

sienna - WordNet (r) 2.1 (2005) :

  sienna
      n 1: an earth color containing ferric oxides; used as a pigment