The Collaborative International Dictionary of English v.0.48:

Kob \Kob\, Koba \Ko"ba\, n. (Zool.)
   Any one of several species of African antelopes of the genus
   Kobus, esp. the species Kobus sing-sing.
   [1913 Webster]

WordNet (r) 3.0 (2006):

kob
    n 1: an orange-brown antelope of southeast Africa [syn: kob,
         Kobus kob]