| any of numerous burrowing rodents, esp. 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. |
| pocket mouse n. 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. |