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rein·deer (rāndîr)
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n. pl. reindeeror rein·deers
A large deer (Rangifer tarandus) of the Arctic tundra and northern boreal forests, having large hooves and long branched antlers, and widely domesticated in Eurasia. Subspecies native to North America and Greenland are usually called caribou.

[Middle English reindere : Old Norse hreinn, reindeer; see ker-1 in the Appendix of Indo-European roots + Middle English der, animal; see DEER.]

Word History: The word reindeer has nothing to do with reins. The element -deer in reindeer is indeed our word deer, but the element rein- has a different origin. Rein, “leather strap for guiding animals,” comes from Old French resne, while the rein- in reindeer is of Scandinavian origin. Wild reindeer once roamed Great Britain in prehistoric times, but they had become extinct long before the Anglo-Saxons invaded the island, or even before the Celts settled it in ancient times. (The small herd of wild reindeer that currently lives in Scotland descends from animals imported from Scandinavia.) To most people in medieval England and Scotland, the reindeer was a foreign creature living in distant Scandinavia, and it is therefore not surprising that the English name of this animal contains an element borrowed from a Scandinavian source. The rein- in Middle English reindere (Modern English reindeer) comes from the Old Norse word for the reindeer, hreinn.

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
 

Indo-European & Semitic Roots Appendices

    Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:

    Indo-European Roots

    Semitic Roots

    The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.