a·pat·o·saur  (ə-pāt'ə-sôr')  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 apatē, untruth, lie + Greek sauros, lizard.] |
| apatosaurus (ə-pāt'ə-sôr'əs) or apatosaur (ə-pāt'ə-sôr'əs) Pronunciation Key
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. |