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Ju·ras·sic | \ ju̇-ˈra-sik 
\
\Definition of Jurassic
: of, relating to, or being the period of the Mesozoic era between the Triassic and the Cretaceous or the corresponding system of rocks marked by the presence of dinosaurs and the first appearance of birds — see Geologic Time Table
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The first known use of Jurassic was in 1831
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