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ball mill

noun
1.
a grinding mill in which the material to be ground is tumbled in a drum with heavy balls of iron, steel, or stone.
Origin
1900-1905
1900-05
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for ball-mill

ball mill

noun
1.
(engineering) a horizontal cylinder or cone in which a substance, such as a mineral, is ground by rotation with steel or ceramic balls
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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6
9
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