| allosaurus | (noun) late Jurassic carnivorous dinosaur; similar to but somewhat smaller than tyrannosaurus | Synonyms: allosaur |
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| ankylosaurus | (noun) having the back covered with thick bony plates; thought to have walked with a sprawling gait resembling a lizard's | Synonyms: ankylosaur |
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| apatosaurus | (noun) huge quadrupedal herbivorous dinosaur common in North America in the late Jurassic | Synonyms: apatosaur, Apatosaurus excelsus, brontosaur, brontosaurus, thunder lizard |
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| barosaurus | (noun) a dinosaur that could grow to be as tall as a building five stories tall | Synonyms: barosaur |
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| brontosaurus | (noun) huge quadrupedal herbivorous dinosaur common in North America in the late Jurassic | Synonyms: apatosaur, apatosaurus, Apatosaurus excelsus, brontosaur, thunder lizard |
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| ceratosaurus | (noun) primitive medium-sized theropod; swift-running bipedal carnivorous dinosaur having grasping hands with sharp claws and a short horn between the nostrils; Jurassic in North America | Synonyms: ceratosaur |
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| corythosaurus | (noun) duck-billed dinosaur with nasal passages that expand into a crest like a hollow helmet | Synonyms: corythosaur |
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| edaphosaurus | (noun) heavy-bodied reptile with a dorsal sail or crest; of the late Paleozoic | - |
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| edmontosaurus | (noun) duck-billed dinosaur from Canada found as a fossilized mummy with skin | - |
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| hadrosaurus | (noun) any of numerous large bipedal ornithischian dinosaurs having a horny duck-like bill and webbed feet; may have been partly aquatic | Synonyms: duck-billed dinosaur, hadrosaur |
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| herrerasaurus | (noun) a kind of theropod dinosaur found in Argentina | Synonyms: herrerasaur |
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| ichthyosaurus | (noun) ichthyosaurs of the Jurassic | - |
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| kurus | (noun) 100 kurus equal 1 lira in Turkey | Synonyms: piaster, piastre |
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| megalosaurus | (noun) gigantic carnivorous bipedal dinosaur of the Jurassic or early Cretaceous in Europe | Synonyms: megalosaur |
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| pachycephalosaurus | (noun) bipedal herbivore having 10 inches of bone atop its head; largest boneheaded dinosaur ever found | Synonyms: pachycephalosaur |
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| pisanosaurus | (noun) primitive dinosaur found in Argentina | Synonyms: pisanosaur |
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| plesiosaurus | (noun) extinct marine reptile with a small head on a long neck and a short tail and four paddle-shaped limbs; of the Jurassic and Cretaceous | Synonyms: plesiosaur |
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| psittacosaurus | (noun) primitive dinosaur actually lacking horns and having only the beginning of a frill; long hind limbs and short forelimbs; may have been bipedal | Synonyms: psittacosaur |
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| staurikosaurus | (noun) primitive dinosaur found in Brazil | Synonyms: staurikosaur |
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| stegosaurus | (noun) herbivorous ornithischian dinosaur with a row of bony plates along its back and a spiked tail probably used as a weapon | Synonyms: stegosaur, Stegosaur stenops |
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| styracosaurus | (noun) an unusual ceratopsian dinosaur having many large spikes around the edge of its bony frill and a long nose horn; late Cretaceous | Synonyms: styracosaur |
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| thesaurus | (noun) a book containing a classified list of synonyms | Synonyms: synonym finder |
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| tyrannosaurus | (noun) large carnivorous bipedal dinosaur having enormous teeth with knifelike serrations; may have been a scavenger rather than an active predator; later Cretaceous period in North America | Synonyms: tyrannosaur, Tyrannosaurus rex |
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| urus | (noun) large recently extinct long-horned European wild ox; considered one of the ancestors of domestic cattle | Synonyms: aurochs, Bos primigenius |
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