Hydroxide is a chemical compound containing the hydroxyl group, consisting of one oxygen and one hydrogen atom. However, there are several synonyms for hydroxide, and some of the commonly used ones include "hydrated oxide," "hydroxybase," and "oxyhydrate," among others. These synonyms all refer to the same chemical compound, which is formed by the reaction of a metal with water. Hydroxides have a variety of applications in different fields, such as in agriculture, medicine, and industry. For example, magnesium hydroxide is used in antacids and laxatives, while aluminum hydroxide is utilized in water purification and as a flame retardant.