/ ˈreɪndɪə(r); NAmE -dɪr/ noun
( pl. rein·deer , rein·deers ) a large deer with long antlers (= horns shaped like branches), that lives in cold northern regions :
herds of reindeer
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WORD ORIGIN
late Middle English : from Old Norse hreindýri , from hreinn reindeer + dýr deer.