grinder in WordNet English dictionary

1. a large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments); different names are used in different sections of the United States
   bomber  grinder  hero  hero sandwich  hoagie  hoagy  Cuban sandwich  Italian sandwich  poor boy  sub  submarine  submarine sandwich  torpedo  wedge  zep 
   
2. a machine tool that polishes metal
   grinder 
   
3. machinery that processes materials by grinding or crushing
   mill  grinder  milling machinery 
   
4. grinding tooth with a broad crown; located behind the premolars
   molar  grinder