Noun: apatosaur
- Huge quadrupedal herbivorous dinosaur common in North America in the late Jurassic
"The apatosaur, formerly known as brontosaurus, had an extremely long neck";
- apatosaurus, brontosaur, brontosaurus, thunder lizard, Apatosaurus excelsus
Derived forms: apatosaurs
Type of: sauropod, sauropod dinosaur
Part of: genus Apatosaurus, genus Brontosaurus
Encyclopedia: Apatosaur