World English Dictionary
coelurosaur (sɪˈljʊərəˌsɔː)
any of various small to very large bipedal carnivorous saurischian dinosaurs belonging to the suborder Theropoda, active in the Triassic and Cretaceous periods; Tyrannosaurus was a coelurosaur, and birds are thought to have evolved from small coelurosaurs
[C20: from New Latin, from Greek koilos hollow + ouros tail + -saur]

Collins English Dictionary - Complete & Unabridged 10th Edition
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