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- A polar bear, Ursus maritimus.
- (obsolete) Any of a number of pinnipeds, but mostly fur seals, and especially the northern fur seal, Callorhinus ursinus.
- The first sense is rarely used except in explanations of the polar bear's scientific name. The second sense has been completely replaced by terms such as fur seal, though it is occasionally listed as a common name in articles on the various species.