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

brachiosaurus

noun
 
/ˌbrækiəˈsɔːrəs/
 
/ˌbrækiəˈsɔːrəs/
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  1. a very large dinosaur whose front legs were much longer than its back legs
    Word Originmodern Latin, from Greek brakhiōn ‘arm’ + sauros ‘lizard’.
See brachiosaurus in the Oxford Advanced American Dictionary
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