Source : Webster's Revised Unabridged Dictionary (1913)

Collie \Col"lie\, n. [Gael. cuilean whelp, puppy, dog.]
   (Zo["o]l.)
   The Scotch shepherd dog. There are two breeds, the
   rough-haired and smooth-haired. It is remarkable for its
   intelligence, displayed especially in caring for flocks.
   [Written also {colly}, {colley}.]

Source : WordNet®

collie
     n : a silky-coated sheepdog with a long ruff and long narrow
         head developed in Scotland