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Definition of otter
- a semiaquatic fish-eating mammal of the weasel family, with an elongated body, dense fur, and webbed feet.
- Lutra and other genera, family Mustelidae: several species, including the river otter (L. canadensis). See also sea otter
Old English otr, ot(t)or, of Germanic origin; related to Greek hudros 'water snake'