dinosaur

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dinosaur

any extinct reptile of the orders Saurischia and Ornithischia. Dinosaurs (the name means ‘fearful lizard’) were the dominant form of land vertebrates during the JURASSIC and CRETACEOUS periods.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005