noun plural -rats or -rat Also called : musquash 1.
a North American beaver-like amphibious rodent
, Ondatra zibethica,
closely related to but larger than the voles
: family Cricetidae
either of two closely related rodents, Ondatra obscurus or Neofiber alleni (round-tailed muskrat)
Collins English Dictionary. Copyright © HarperCollins Publishers
Word origin of 'muskrat'C17: by folk etymology, from the same source as musquash