Potassium hydroxide is a white, caustic inorganic compound, which is also known as caustic potash. This compound, which is a strong alkaline solution, has several common synonyms, including potassium hydrate, potassium lye, potash lye, and caustic potassium. Potassium hydroxide is widely used in the chemical industry for the production of soap, liquid detergents, and in the manufacture of several other chemicals. It is also an important ingredient in the processing of foods and beverages, as well as in the production of biodiesel. These synonyms for potassium hydroxide can be used interchangeably in various industrial and scientific applications.