[ dʒʊ'rasɪk ]
■ adjective Geology relating to or denoting the second period of the Mesozoic era (between the Triassic and Cretaceous periods, about 208 to 146 million years ago), a time when large reptiles were dominant and the first birds appeared.
Origin
C19: from Fr. jurassique ; named after the Jura Mountains on the border of France and Switzerland.