coelurosaur
Concise Oxford English Dictionary © 2008 Oxford University Press:
coelurosaur /sɪˈljʊərəsɔː/
▶noun a small slender bipedal carnivorous dinosaur with long forelimbs, believed to be an evolutionary ancestor of birds.
– origin 1950s: from Gk koilos ‘hollow’ + oura ‘tail’ + sauros ‘lizard’.
'coelurosaur' also found in these Oxford entries:

