| kangaroo rat |
any of various long-tailed and long-legged jumping rodents of desert regions in Mexico and the western United States, or a similar one of Australia. |
| pack rat |
a large, bushy-tailed, North American rodent known to gather and hide small objects in its nest. [2 definitions] |
| rat kangaroo |
any of various small ratlike kangaroos that are about the size of a rabbit. |
| rat mite |
a widespread mite carried by rats that can transmit typhus to humans or cause inflammation of the skin by its bite. |
| rat race |
(informal) an exhausting, competitive struggle or routine. |
| rat snake |
any of several nonpoisonous snakes of North America and Eurasia that eat rodents and other small mammals. |
| rat-a-tat |
a series of short, sharp sounds, as from knocking or machine-gun fire. |
| rat-tail |
any of several deep-sea fishes with a large head and a long, tapering tail; grenadier. |
| smell a rat |
to suspect that something is wrong. |
| water rat |
any of various semiaquatic rodents of Australia, Florida, and southern Georgia, that resemble the muskrat. [2 definitions] |
| wharf rat |
any of various large brown rats commonly found around wharves. [2 definitions] |