Definition of "Jurassic"

His father squinted at the skeleton. “What is it, Jurassic?” “Jeez. No. Cretaceous.” “Cretaceous? What's the difference between Cretaceous and Jurassic?” “Only about a hundred million years,” Tim said. “Cretaceous is older?” “No, Dad, Jurassic is older.”

1990, Michael Crichton, Jurassic Park, Alfred A. Knopf, page 94

The Jurassic, the Spanish and the Italian federations and sections of the International Working Men's Association, as also the French, the German and the American anarchist groups, were for the next years the chief centres of anarchist thought and propaganda.

1910, Peter Kropotkin, “Anarchism”, in Encyclopædia Britannica

Those fears and excuses seem positively Jurassic more than eighty years later.

2009 March, Byron Rempel, “Women's Ski Jumping Takes Aim at the Winter Olympics”, in Skiing Heritage Journal, volume 21, number 1, page 17

For every three shops or restaurants that looked as if they might have had a poster of Che Guevara somewhere on the premises, there was one stubborn Jurassic retailer offering knit suits for older women or an Italian restaurant that offered all-you-can-eat garlic bread and didn't call itself a trattoria.

2017, Dean Koontz, The Silent Corner, page 93

Well, thirty compared to twenty-five seemed Jurassic to me back then.

2017, Giuliana Prada, Hiding Boys in Bathrooms: A Decade of Dating Debacles

Like the Forest Marble Beds in the Middle Jurassic, the Purbeck Beds of the Upper Jurassic are deltaic or estuarine in origin, so as well as mammals they contain small, presumably freshwater, crocodiles and the first indisputable lizards. / This is less surprising if it is recalled that in the Upper Jurassic, Europe and North America were joined to form Laurasia and the Atlantic Ocean still had to be formed [...]

D. M. Kermack, K. A. Kermack, The Evolution of Mammalian Characters