1. Huge quadrupedal herbivorous dinosaur common in North America in the late Jurassic
   - apatosaur, apatosaurus, brontosaur, thunder lizard, Apatosaurus excelsus

Derived forms: brontosauruses

Type of: sauropod, sauropod dinosaur

Part of: genus Apatosaurus, genus Brontosaurus

Encyclopedia: Brontosaurus

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