- any of various rodents having aquatic habits.
- the muskrat, Ondatra zibethica.
- (in Australia and New Guinea) any of the aquatic rats of the subfamily Hydromyinae, especially of the genus Hydromys.
- a vagrant or thief who frequents a waterfront.
- any of several small amphibious rodents, esp the water vole or the muskrat
- any of various amphibious rats of the subfamily Hydromyinae, of New Guinea, the Philippines, and Australia
- a person who is very fond of water sports
