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

apatosaurus

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