Source : Webster's Revised Unabridged Dictionary (1913)

Deerhound \Deer"hound`\, n. (Zo["o]l.)
   One of a large and fleet breed of hounds used in hunting
   deer; a staghound.

Source : WordNet®

deerhound
     n : very large and tall rough-coated dog bred for hunting deer;
         known as the royal dog of Scotland [syn: {Scottish
         deerhound}]