saur·is·chi·an 
(sô-rĭskē-ən)
(sô-rĭskē-ən)n.
Any of various dinosaurs of the order Saurischia, having a pubic bone that points down and forward like that of modern reptiles, and including the sauropods, such as apatosaurus, and the theropods, such as T. rex.
[From New Latin Saurischia, order name : Greek sauros, lizard + Greek iskhion, hip joint.]
saur·ischi·an adj.