Source : Webster's Revised Unabridged Dictionary (1913)

Clydesdale \Clydes"dale\, n.
   One of a breed of heavy draft horses originally from
   Clydesdale, Scotland. They are about sixteen hands high and
   usually brown or bay.

Source : WordNet®

Clydesdale
     n : heavy feathered-legged breed of draft horse originally from
         Scotland