a·pat·o·saur ( -p t -sôr ) or a·pat·o·sau·rus (-pt-sôrs)n. A very large herbivorous dinosaur of the genus Apatosaurus (formerly Brontosaurus) of the late Jurassic period, having a long neck and tail and a relatively small head. [New Latin Apatosaurus, unreal lizard, genus name : Greek apat  , untruth, lie + Greek sauros, lizard.] |
| apatosaurus (-pt-sôrs) or apatosaur (-pt-sôr) A very large sauropod dinosaur of the genus Apatosaurus (or Brontosaurus) of the late Jurassic Period. Apatosaurs had a long neck and tail and a relatively small head. See Note at brontosaurus. |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. |  apatosaurus - huge quadrupedal herbivorous dinosaur common in North America in the late Jurassicsauropod, sauropod dinosaur - very large herbivorous dinosaur of the Jurassic and Cretaceous having a small head a long neck and tail and five-toed limbs; largest known land animal genus Apatosaurus, genus Brontosaurus - large quadrupedal herbivorous dinosaurs with very long neck and tail; late Jurassic |
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