The Collaborative International Dictionary of English v.0.48:

Brocket \Brock"et\ (br[o^]k"[e^]t), n. [OE. broket, F. broquart
   fallow deer a year old, fr. the same root as E. broach,
   meaning point (hence tine of a horn).]
   1. (Zool.) A male red deer two years old; -- sometimes called
      brock.
      [1913 Webster]

   2. (Zool.) A small South American deer, of several species
      (Coassus superciliaris, Coassus rufus, and Coassus
      auritus).
      [1913 Webster]