apatosaur

Science Dictionary
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.
The American Heritage® Science Dictionary
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