pocket mouse definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
any of various small, nocturnal, long-tailed mice (family Heteromyidae) with fur-lined cheek pouches for carrying food to their burrows: found in W and SW North America
pocket mouse definition by American Heritage Dictionary
Any of various small, nocturnal North American burrowing rodents of the genus Perognathus, related to the kangaroo rat and having fur-lined external cheek pouches, small ears, and a long tail.