coelurosaur
/sɪˈljʊərəsɔː(r)/noun
1- a small slender bipedal carnivorous dinosaur with long forelimbs, from which the birds are believed to have evolved.虚骨龙（据认为鸟类由此种恐龙进化而来）。
1.1
- Infraorder Coelurosauria, suborder Theropoda, order Saurischia: many genera.虚骨龙下目, 兽脚亚目, 蜥臀目：多属。
词源
1950s: from Greek koilos 'hollow' + oura 'tail' + sauros 'lizard'.