Source : Webster's Revised Unabridged Dictionary (1913)

Caribou \Car"i*bou\ (k[a^]r"[i^]*b[=oo]), n. [Canadian French.]
   (Zo["o]l.)
   The American reindeer, especially the common or woodland
   species ({Rangifer Caribou}).

   {Barren Ground caribou}. See under {Barren}.

   {Woodland caribou}, the common reindeer ({Rangifer Caribou})
      of the northern forests of America.

Source : WordNet®

caribou
     n : arctic deer with large antlers in both sexes; called
         reindeer in Eurasia and caribou in North America [syn: {reindeer},
          {Greenland caribou}, {Rangifer tarandus}]