- any member of the suborder Theropoda, comprising carnivorous dinosaurs that had short forelimbs and walked or ran on their hind legs.
- any bipedal carnivorous saurischian dinosaur of the suborder Theropoda, having strong hind legs and grasping hands. They lived in Triassic to Cretaceous times and included tyrannosaurs and megalosaurs
- Any of various carnivorous saurischian dinosaurs of the group Theropoda. Theropods walked on two legs and had small forelimbs and a large skull with long jaws and sharp teeth. Most theropods were of small or medium size, but some grew very large, like Tyrannosaurus. Theropods lived throughout the Mesozoic Era. Compare sauropod.