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pocket mouse

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noun
  1. any of numerous burrowing rodents, especially of the genus Perognathus, chiefly inhabiting arid regions of the southwestern U.S. and northern Mexico, having fur-lined cheek pouches and a long tail.
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Origin of pocket mouse

An Americanism dating back to 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for pocket mouse

pocket mouse

noun
  1. any small mouselike rodent with cheek pouches, of the genus Perognathus, of desert regions of W North America: family Heteromyidae
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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