grinder

noun

1. 1

   a machine tool that polishes metal

2. 2

   machinery that processes materials by grinding or crushing

3. 3

   grinding tooth with a broad crown; located behind the premolars

4. 4

   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