Definition of apatosaurus noun from the Oxford Advanced Learner's Dictionary

 

apatosaurus

 noun
noun
BrE BrE//əˌpætəˈsɔːrəs//
 
; NAmE NAmE//əˌpætəˈsɔːrəs//
 
(also brontosaurus)
 
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a very large dinosaur with a long neck and tail Word Originmodern Latin, from Greek apatē ‘deceit’ + sauros ‘lizard’.
See the Oxford Advanced American Dictionary entry: apatosaurus