Noun genus thalarctos has 1 sense
  1. Thalarctos, genus Thalarctos - polar bears; in some classifications not a separate genus from Ursus
    --1 is a kind of mammal genus
    --1 is a member of Ursidae, family Ursidae
    --1 has members: ice bear, polar bear, Ursus Maritimus, Thalarctos maritimus
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