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A small, hard piece of rock or mineral material.

A hard mass of mineral material that forms in the body, such as in the kidney or gallbladder.

A solid mass of mineral material forming part of the Earth's surface.

A diamond or other precious stone, especially one that is large and eye-catching.

A small, hard, stone-like mass that forms inside the body, especially in the kidneys, urinary tract, or gallbladder.

A small piece of very hard material, typically synthetic ruby or sapphire, used as a bearing in a watch or clock mechanism to reduce friction and wear.