coelurosaur

/ sɪˈljʊərəˌsɔː /

noun

1. 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

Word History and Origins

Origin of coelurosaur¹

C20: from New Latin, from Greek koilos hollow + ouros tail + -saur