A group of apatosaurus or brontosaurus
apatosaurus definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
any of a genus (Apatosaurus) of huge sauropod dinosaurs of the Late Cretaceous, weighing more than 18,000 kg (20 tons)
apatosaurus - Science Definition
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.