(1) An ore of boron consisting of hydrated sodium borate; used as a flux or cleansing agent
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- A white or gray/grey crystalline salt, with a slight alkaline taste, used as a flux, in soldering metals, making enamels, fixing colors/colours on porcelain, and as a soap, etc.
- The sodium salt of boric acid, Na2B4O7, either anhydrous or with 5 or 10 molecules of water of crystallisation; sodium tetraborate.
- Cheap or tawdry, referring to furniture or other works of industrial design.