Definition of Japanese weasel
: a weasel native to Japan that is considered either a subspecies (Mustela sibirica sibirica) of the Siberian weasel or a separate species (Mustela itatsai)
also
: the fur of the Japanese weasel
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Merriam-Webster unabridged
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Time Traveler for Japanese weasel
The first known use of Japanese weasel was in 1864
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