Definition from Wiktionary, the free dictionary
- 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.
- (chemistry) The sodium salt of boric acid, Na2B4O7, either anhydrous or with 5 or 10 molecules of water of crystallisation; sodium tetraborate.
Derived terms 
borax (not comparable)
- Cheap or tawdry, referring to furniture or other works of industrial design.
- borax at the Free Dictionary