Noun genus brontosaurus has 1 sense
  1. genus Apatosaurus, genus Brontosaurus - large quadrupedal herbivorous dinosaurs with very long neck and tail; late Jurassic
    --1 is a kind of reptile genus
    --1 is a member of Sauropoda, suborder Sauropoda
    --1 has members:
     apatosaur, apatosaurus, brontosaur, brontosaurus, thunder lizard, Apatosaurus excelsus
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