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

caterpillar track \cat"erpil`lar track\, n.
   an endless belt looped over several wheels, used in pairs in
   place of wheels to propel vehicles, such as tractors or
   military tanks, over rough ground.
   pjc

[2] : WordNet (r) 2.0

caterpillar track
     n : an endless metal belt on which tracked vehicles move over
         the ground syn: track, caterpillar tread
see also:
track caterpillar tread 

Caterpillar >> C Words
Caterpillar, definition of term: Caterpillar
caterpillar_pag1.html

Track >> T Words
Track, definition of term: Track
track_pag1.html

Track Down >> T Words
Track Down, definition of term: Track Down
track+down_pag1.html

Dirt Track >> D Words
Dirt Track, definition of term: Dirt Track
dirt+track_pag1.html

Track And Field >> T Words
Track And Field, definition of term: Track And Field
track+and+field_pag1.html