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| Ju·ras·sic [ j rássik ] |
noun |
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| Definition: |
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geologic period: the period of geologic time, 206 million years to 144 million years ago, during which dinosaurs flourished and birds and mammals first appeared. It is the middle period of the Mesozoic era.
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| [Mid-19th century. < French Jurassique< Jura "Jura"] |
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 Ju·ras·sic adjective |
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