Source : Webster's Revised Unabridged Dictionary (1913)

Kaffir \Kaf"fir\, Kafir \Ka"fir\, n. [Ar. k?fir infidel, pagan,
   fr. kafara to be skeptical in religious matters; -- a name
   given to certain infidel races by the Mohammedans. Cf.
   {Giaour}.] (Ethnol.)
   (a) One of a race which, with the Hottentots and Bushmen,
       inhabit South Africa. They inhabit the country north of
       Cape Colony, the name being now specifically applied to
       the tribes living between Cape Colony and Natal; but the
       Zulus of Natal are true Kaffirs.
   (b) One of a race inhabiting Kafiristan in Central Asia.
       [Spelt also {Caffre}.]

   {Kaffir corn} (Bot.), a Cape Colony name for Indian millet.

Source : WordNet®

kaffir
     n 1: important for human and animal food; growth habit and stem
          form similar to Indian corn but having sawtooth-edged
          leaves [syn: {great millet}, {kafir corn}, {kaffir corn},
           {Sorghum bicolor}]
     2: an offensive term for any Black African [syn: {kafir}, {caffer},
         {caffre}]