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mule deer

American  

noun

  1. a deer, Odocoileus hemionus, of western North America, having large ears and a gray coat.


mule deer British  

noun

  1. a W North American deer, Odocoileus hemionus, with long ears and a black-tipped tail

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of mule deer

An Americanism dating back to 1795–1805