1. Huge quadrupedal herbivorous dinosaur common in North America in the late Jurassic
   "The apatosaurus, formerly known as brontosaurus, had an extremely long neck"; "The Apatosaurus excelsus, formerly known as brontosaurus, had an extremely long neck";
   - apatosaur, brontosaur, brontosaurus, thunder lizard, Apatosaurus excelsus

Derived forms: apatosauruses

Type of: sauropod, sauropod dinosaur

Part of: genus Apatosaurus, genus Brontosaurus

Encyclopedia: Apatosaurus