A large steel cylinder containing steel balls into which crushed ore is fed. The ball mill is rotated, causing the balls to cascade and grind the ore.

A rotating horizontal cylinder with a diameter almost equal to the length supported by a frame or shaft, in which nonmetallic materials are ground using various types of grinding media such as quartz [..]

A relatively high-energy mill consisting of one or more balls in a chamber and used to reduce the particle size of solids. In the process, the ball mill may induce undesired solid-solid reactions or create amorphous material.

A mechanically revolving vessel in which ceramic materials can be placed along with water and flint pebbles or high-fired porcelain slugs. Used to grind clay and glaze materials. Source: Clay: A Studio Handbook

A ball mill is a cylindrical horizontally rotating grinding device, charged with grinding media, usually balls or pebbles, used to produce fine product. They operate on both laboratory and industrial scale and maybe batch or continuously fed with liquids or solids.

A device that grinds material very finely by means of a horizontally rotating drum containing ceramic or metal balls