The Collaborative International Dictionary of English v.0.48:

Vitta \Vit"ta\, n.; pl. Vittae. [L. vitta ribbon, fillet.]
   1. (Bot.) One of the oil tubes in the fruit of umbelliferous
      plants.
      [1913 Webster]

   2. (Zool.) A band, or stripe, of color.
      [1913 Webster]