The Collaborative International Dictionary of English v.0.48:

Water chevrotain \Wa"ter chev`ro*tain"\ (Zool.)
   A large West African chevrotain (Hyaemoschus aquaticus). It
   has a larger body and shorter legs than the other allied
   species. Called also water deerlet.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Boomorah \Boo"mo*rah\, n. [Native name.] (Zool.)
   A small West African chevrotain (Hy[ae]moschus aquaticus),
   resembling the musk deer.
   [1913 Webster]