Tetraboric acid, also known as boron tetraoxide or boron oxide, is a compound that consists of four boron atoms and ten oxygen atoms. This acid is widely used in various industrial applications, including the manufacturing of glass, ceramics, and enamels. However, if you're looking for synonyms to describe this compound, there aren't many commonly used alternatives. One possibility could be "boric anhydride", which refers to the anhydrous form of tetraboric acid. Additionally, you might come across the term "borax", which is a sodium borate compound and could be considered a related synonym.