ferret(redirected from Fert)
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a member of the family Mustelidae. The common ferret (Mustela putorius furo) is an albino variant of the European polecat M. putorius putorius. It has yellow-brown fur and pinkish-red eyes. The polecat-ferret has brown fur. A North American native, the black-footed ferret (M. nigripes) has a black face mask and brown-black markings on the tail and feet. The female ferret is called a jill, the male a hob, and the offspring, kittens. Ferrets are highly susceptible to infection by the canine distemper virus.