Ju‐ras″sic (?), a.(Geol.) Of the age of the middle Mesozoic, including, as divided in England and Europe, the Lias, Oölite, and Wealden; — named from certain rocks of the Jura mountains. — n. The Jurassic period or formation; — called also the Jura.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.