DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   grinding
       n 1: material resulting from the process of grinding; "vegetable
            grindings clogged the drain"
       2: a harsh and strident sound (as of the grinding of gears)
       3: the wearing down of rock particles by friction due to water
          or wind or ice [syn: grinding, abrasion, attrition,
          detrition]