Basic anhydride is a term that is commonly used in chemistry to describe a compound that reacts with water to form a strong alkaline solution. Synonyms for basic anhydride include alkaline oxide, basic oxide, and strong base. Basic oxides are typically formed when metals react with oxygen, and they have a high affinity for water, making them useful in a variety of applications. Examples of basic anhydrides include calcium oxide (CaO), magnesium oxide (MgO), and sodium oxide (Na2O). These compounds are commonly used in the production of cement, fertilizers, and various other industrial processes, making them important substances in modern chemistry.