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Definition of WEASEL
or pluralweasel: any of various small slender active carnivorous mammals (genus Mustela of the family Mustelidae, the weasel family) that are able to prey on animals (as rabbits) larger than themselves, are mostly brown with white or yellowish underparts, and in northern forms turn white in winter — compare ermine 1a
: a light self-propelled tracked vehicle built either for traveling over snow, ice, or sand or as an amphibious vehicle
Long-tailed weasel (Mustela frenata).—John H. Gerard
Any of several genera (carnivore family Mustelidae) of voracious nocturnal predators found throughout the Americas, Africa, and Eurasia. Weasels have slender bodies and necks, small flat heads, short legs, clawed toes, dense short fur, and slim pointed tails. The size and relative length of the tail vary among species. Their total length is 7–20 in. (17–50 cm), and they may weigh 1–12 oz (30–350 g). The approximately 10 New World and Eurasian species of Mustela are reddish brown; in cold regions, their winter coat turns white, and the pelt, especially of the stoat (M. erminea), is called ermine. Weasels generally hunt alone, feeding on rodents, fish, frogs, and birds' eggs.