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Noun: apatosaurus  u,pa-tu'so-rus
  1. Huge quadrupedal herbivorous dinosaur common in North America in the late Jurassic
    - apatosaur, brontosaur, brontosaurus, thunder lizard, Apatosaurus excelsus

Derived forms: apatosauruses

Type of: sauropod, sauropod dinosaur

Part of: genus Apatosaurus, genus Brontosaurus

Encyclopedia: Apatosaurus