What does "barilla" mean?

Barilla: (Com.) (a) The alkali produced from the plant, being an impure carbonate of soda, used for making soap, glass, etc., and for bleaching purposes. (b) Impure soda obtained from the ashes of any seashore plant, or kelp. Ure. Copper barilla (Min.), native copper in granular form mixed with sand, an ore brought from Bolivia; -- called also Barilla de cobre.