Ball mill
a grinding mill in which the material to be ground is tumbled in a drum with heavy balls of iron, steel, or stone.
Historical Examples
In another type of mill, called the ball mill, the principle is different.
Marvels of Scientific Invention Thomas W. Corbin
noun
(engineering) a horizontal cylinder or cone in which a substance, such as a mineral, is ground by rotation with steel or ceramic balls
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a tract of land where ball games, especially baseball, are played. a baseball stadium. Informal. being an approximation, based on an educated guess: Give me a ballpark figure on our total expenses for next year. in the ballpark, Informal. within reasonable, acceptable, or expected limits: The price may go up another $10, but that’s still […]
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