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A millstone is a large round stone used in a mill for grinding grain or other materials. It typically consists of two circular stones, one placed on top of the other, with the grain being ground between them. Millstones have been used for centuries in various cultures around the world to produce flour, meal, and other ground products. They are typically made of hard, durable materials such as granite or basalt and are designed to be sturdy and long-lasting. Millstones are an important tool in the process of milling and have played a crucial role in the development of agriculture and food production.