- A hydrated sodium borate, Na<sub>2</sub>B<sub>4</sub>O<sub>7</sub><strong>·</strong>10H<sub>2</sub>O, an ore of boron, that is used as a cleaning compound.
- Cheap merchandise, especially tasteless furnishings.
- Sodium tetraborate or pyroborate, Na<sub>2</sub>B<sub>4</sub>O<sub>7</sub> + 10H<sub>2</sub>O, a salt formed by the union of boracic acid and soda.
- A white or gray crystalline salt, with a slight alkaline taste, used as a flux, in soldering metals, making enamels, fixing colors on porcelain, and as a soap. It occurs native in certain mineral springs, and is made from the boric acid of hot springs in Tuscany. It was originally obtained from a lake in Thibet, and was sent to Europe under the name of <ex>tincal</ex>. Borax is a pyroborate or tetraborate of sodium, Na2B4O7.10H2O.
- See <er>Bead</er>, n., 3.
- A white or gray/grey <xref>crystalline</xref> salt, with a slight <xref>alkaline</xref> taste, used as a <xref>flux</xref>, in <xref>soldering</xref> metals, making <xref>enamels</xref>, fixing colors/colours on <xref>porcelain</xref>, and as a soap, etc.
- The <xref>sodium</xref> <xref>salt</xref> of <xref>boric acid</xref>, Na2B4O7, either <xref>anhydrous</xref> or with 5 or 10 <xref>molecules</xref> of <xref>water of crystallisation</xref>; <xref>sodium tetraborate</xref>.
- Cheap or tawdry, referring to furniture or other works of industrial design.
- an ore of boron consisting of hydrated sodium borate; used as a flux or cleansing agent