ursus arctos(n = noun.animal) brown bear, bruin - large ferocious bear of Eurasia;
is a kind of bear
is a member of genus ursus, ursus
has particulars: syrian bear, ursus arctos syriacus, grizzly, grizzly bear, silver-tip, silvertip, ursus arctos horribilis, ursus horribilis, alaskan brown bear, kodiak, kodiak bear, ursus arctos middendorffi, ursus middendorffi

genus ursus, ursus, ursus americanus, ursus arctos horribilis, ursus arctos middendorffi, ursus arctos syriacus, ursus horribilis, ursus maritimus, ursus middendorffi, ursus thibetanus, ursus ursinus