From WordNet (r) 2.0 (August 2003) [wn]:
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]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Caribou \Car"i*bou\ (k[a^]r"[i^]*b[=oo]), n. [Canadian French.]
(Zool.)
The American reindeer, especially the common or woodland
species (Rangifer Caribou).
[1913 Webster]
Barren Ground caribou. See under Barren.
Woodland caribou, the common reindeer (Rangifer Caribou)
of the northern forests of America.
[1913 Webster]