The Collaborative International Dictionary of English v.0.48:

Markhoor \Mark"hoor`\, markhor \mark"hor`\, n. [Per.
   m[=a]r-kh[=o]r snake eater.] (Zool.)
   A large wild goat (Capra falconeri syn. Capra megaceros),
   having huge flattened spiral horns. It inhabits the mountains
   of Northern India and Cashmere.
   [1913 Webster]

WordNet (r) 3.0 (2006):

markhor
    n 1: large Himalayan goat with large spiraled horns [syn:
         markhor, markhoor, Capra falconeri]