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Latin word lutra comes from Proto-Indo-European *wei-, and later Proto-Indo-European *udrós (Of water, aquatic.)
*wei- (Proto-Indo-European)
to turn, bend, to twist, bend, to move, go ahead; to be strong
*wed- (Proto-Indo-European)
wet
*udrós (Proto-Indo-European)
Of water, aquatic.
lutra (Latin)
An otter.