coelurosaur /sɪˈljʊərəˌsɔː/

• 1. 

  N 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 虚骨龙