'Grinder' definitions:

Definition of 'grinder'

noun

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 [syn: bomber, grinder, hero, hero sandwich, hoagie, hoagy, Cuban sandwich, Italian sandwich, poor boy, sub, submarine, submarine sandwich, torpedo, wedge, zep]

noun

Grinding tooth with a broad crown; located behind the premolars [syn: molar, grinder]

noun

Machinery that processes materials by grinding or crushing [syn: mill, grinder, milling machinery]

noun

A machine tool that polishes metal

From: GCIDE

Grinder \Grind"er\, n.
1. One who, or that which, grinds. [1913 Webster]
2. One of the double teeth, used to grind or masticate the food; a molar. [1913 Webster]
3. (Zool.) The restless flycatcher (Seisura inquieta) of Australia; -- called also restless thrush and {volatile thrush}. It makes a noise like a scissors grinder, to which the name alludes.
4. A submarine sandwich. [local, U.S.]
Syn: submarine, hoagie. [PJC]
Grinder's asthma, Grinder's phthisis, or Grinder's rot (Med.), a lung disease produced by the mechanical irritation of the particles of steel and stone given off in the operation of grinding. [1913 Webster]

From: GCIDE

Sub \Sub\, n.
1. A subordinate; a subaltern. [Colloq.] [1913 Webster]
2. a shortened form of submarine, the boat. [PJC]
3. a shortened form of submarine sandwich; also called hero, hero sandwich, and grinder. [PJC]

From: GCIDE

submarine sandwich \sub`ma*rine" sand"wich\, n. A large sandwich on an elongated roll, usually incompletely cut into two halves, filed with various cold cuts, meatballs, lettuce, cheese, tomatoes, olives, etc., and spiced variously, and often having oil or other dressing applied; called also hoagie, hero, hero sandwich, grinder, sub, submarine, poor boy, and Italian sandwich. A single such sandwich may consitute a substantial meal. Very large variants are sometimes prepared for social gatherings and cut into pieces for individual consumption. [PJC]

From: GCIDE

hoagie \hoagie\, hoagy \hoagy\n. a large sandwich on a long crusty roll that is 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 U. S., such as hero, grinder, and submarine.
Syn: bomber, grinder, hero, hero sandwich, hoagie, Cuban sandwich, Italian sandwich, poor boy, sub, submarine, submarine sandwich, torpedo, wedge, zep. [WordNet 1.5]