from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. 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.
from the GNU version of the Collaborative International Dictionary of English
- n. a genus of extinct dinosaurs comprising the brontosaurs; apatosaurs.
from The Century Dictionary and Cyclopedia
- n. A genus of dinosaurian reptiles of the family Camarasauridæ, described by Marsh from the Upper Jurassic rocks of Colorado.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. huge quadrupedal herbivorous dinosaur common in North America in the late Jurassic
Sorry, no etymologies found.