What is the name of the polyatomic ion with the formula OH⁻?

Hydroxide is a fundamental polyatomic ion formed by one oxygen atom covalently bonded to one hydrogen atom. It is a key component of bases, providing their alkaline properties. Hydroxide ions participate in various chemical reactions, especially neutralization reactions with acids, resulting in the formation of water and salts. Its presence is critical in many biological and chemical processes, including the regulation of pH in biological systems.