From 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]