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

 

coelurosaur

 noun
noun
BrE BrE//sɪˈljʊərəsɔː(r)//
 
; NAmE NAmE//sɪˈljʊərəsɔːr//
 
 
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a small thin dinosaur with long front legs, that is thought to be the ancestor of birds Word Origin 1950s: from Greek koilos ‘hollow’ + oura ‘tail’ + sauros ‘lizard’.
See the Oxford Advanced American Dictionary entry: coelurosaur