Also found in: Thesaurus.
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|Noun||1.||psittacosaur - primitive dinosaur actually lacking horns and having only the beginning of a frill; long hind limbs and short forelimbs; may have been bipedal|
ceratopsian, horned dinosaur - any of several four-footed herbivorous dinosaurs with enormous beaked skulls; of the late Cretaceous in North America and Mongolia
genus Psittacosaurus - most primitive genus of horned dinosaurs; early Cretaceous