What do a.m. and p.m. stand for?

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.
Origin of ball mill
1900-05 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for ball mill
  • Only a ball mill and organic acid feed system will be added.
  • Initially the first mill will be installed as a scrubber mill that will later be upgraded to a ball mill when treating sulfides.
British Dictionary definitions for ball mill

ball mill

(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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