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

 

brachiosaurus

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