Reindeer

n. any of several species of large deer inhabiting arctic and sub-arctic regions

The reindeer, known as caribou when wild in North America, is an Arctic and Subarctic-dwelling deer (Rangifer tarandus).
See more at Wikipedia.org...

Noun
1. arctic deer with large antlers in both sexes; called reindeer in Eurasia and caribou in North America
(synonym) caribou, Greenland caribou, Rangifer tarandus
(hypernym) deer, cervid
(hyponym) woodland caribou, Rangifer caribou
(member-holonym) Rangifer, genus Rangifer

(n.)
Any ruminant of the genus Rangifer, of the Deer family, found in the colder parts of both the Eastern and Western hemispheres, and having long irregularly branched antlers, with the brow tines palmate.
  

To dream of a reindeer, signifies faithful discharge of duties, and remaining staunch to friends in their adversity.

To drive them, foretells that you will have hours of bitter anguish, but friends will attend you.