apatosaurus

WORDNET DICTIONARY

apatosaurus(n = noun.animal) apatosaur, apatosaurus excelsus, brontosaur, brontosaurus, thunder lizard - huge quadrupedal herbivorous dinosaur common in North America in the late Jurassic;

is a kind of sauropod, sauropod dinosaur

is a member of genus apatosaurus, genus brontosaurus

apatosaurus, n.

a genus of extinct dinosaurs comprising the brontosaurs; apatosaurs. [WordNet 1.5]