| styracosaur | (noun) an unusual ceratopsian dinosaur having many large spikes around the edge of its bony frill and a long nose horn; late Cretaceous | Synonyms: styracosaurus |
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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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| styrax | (noun) any shrub or small tree of the genus Styrax having fragrant bell-shaped flowers that hang below the dark green foliage | - |
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| styrene | (noun) a colorless oily liquid; the monomer for polystyrene | Synonyms: cinnamene, phenylethylene, vinylbenzene |
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