- a large, aquatic, North American rodent, Ondatra zibethica, having a musky odor.
- its thick, light-brown fur, used for coats, for hats, as a trimming, etc.
- a North American beaver-like amphibious rodent, Ondatra zibethica, closely related to but larger than the voles: family Cricetidae
- the brown fur of this animal
- either of two closely related rodents, Ondatra obscurus or Neofiber alleni (round-tailed muskrat)
