1. A large deer native to North America, also called reindeer in Europe and Siberia. In Canadian English also tuktu: "After a long trek in the woods during the winter season, the German hikers were finally rewarded with a view of a herd of magnificent caribou with their huge beautiful antlers."

"These caribou, or reindeer, had only been seen in books back in Germany."
2. Etymology: from Canadian French; of Algonquian origin.