apatosaurus (ə-pāt’ə-sôr’əs) or apatosaur
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.
Historical Examples

This was about thirty feet long, and is known as apatosaurus grandis.
Extinct Monsters H. N. Hutchinson


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