The Collaborative International Dictionary of English v.0.48:

Napu \Na*pu"\, n. [Native name.] (Zool.)
   A very small chevrotain (Tragulus Javanicus), native of
   Java. It is about the size of a hare, and is noted for its
   agility in leaping. Called also Java musk deer, pygmy musk
   deer, and deerlet.
   [1913 Webster]

WordNet (r) 3.0 (2006):

napu
    n 1: chevrotain somewhat larger than the kanchil; found in India
         and Malaya [syn: napu, Tragulus Javanicus]