The Collaborative International Dictionary of English v.0.48:

Muntjac \Munt"jac\, n. (Zool.)
   Any one of several species of small Asiatic deer of the genus
   Cervulus, esp. Cervulus muntjac, which occurs both in
   India and on the East Indian Islands. [Written also
   muntjak.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

muntjac
    n 1: small Asian deer with small antlers and a cry like a bark
         [syn: muntjac, barking deer]