[1] : The Collaborative International Dictionary of English v.0.48

submarine sandwich \sub`marine" 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
see also:
hoagie hero hero sandwich grinder sub submarine 
poor boy italian sandwich 

[2] : WordNet (r) 2.0

submarine sandwich
     n : 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,
          torpedo, wedge, zep
see also:
bomber grinder hero hero sandwich hoagie hoagy 
cuban sandwich italian sandwich poor boy sub submarine 
torpedo wedge zep 

Submarine >> S Words
Submarine, definition of term: Submarine
submarine_pag1.html

Sandwich >> S Words
Sandwich, definition of term: Sandwich
sandwich_pag1.html