apatosaur

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a·pa·to·saur / ˌapitōˈsôrəs/ (also apatosaurus / -ˈsôrəs/ ) • n. a huge herbivorous dinosaur (genus Apatosaurus, infraorder Sauropoda, order Saurischia) of the late Jurassic period, with a long neck and tail. Also called, esp. formerly, brontosaurus. DERIVATIVES: a·pa·to·sau·ri·an adj.

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