The Collaborative International Dictionary of English v.0.48:

Chacma \Chac"ma\, n. [Native name.]
   A large species of African baboon (Cynocephalus porcarius);
   -- called also ursine baboon.

   Note: [See Illust. of Baboon.]
         [1913 Webster]

WordNet (r) 3.0 (2006):

chacma
    n 1: greyish baboon of southern and eastern Africa [syn:
         chacma, chacma baboon, Papio ursinus]