Wiktionary
rice rat
n. 1 A New World rat of the genus ''Oryzomys'', having an exceptionally long tail. 2 A rat of the species ''Oryzomys palustris'', found in rice fields and grassy marshes of Mexico, Central America and the southern United States.
WordNet
rice rat
n. hardy agile rat of grassy marshes of Mexico and the southeastern United States [syn: Oryzomys palustris]