Ornithoscelida n. pl. (Zool.) A group of extinct Reptilia, intermediate in structure (especially with regard to the pelvis) between reptiles and birds.
...ORNITHOSCELIDA (Gr. ornis, bird; skelos, leg). Applied by Huxley to the Deinosaurian Reptiles, together with the genus Compsognathus, on account of the bird-like character ... — The Ancient Life History of the Earth • Henry Alleyne Nicholson