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Meaning of brontosaur

bron•to•saur

Pronunciation: (bron'tu-sôr"), [key]
— n.
  1. a huge sauropod dinosaur of the genus Apatosaurus (formerly Brontosaurus) and closely related genera, of the Jurassic Period, having a massive body, a small head and long neck, and thick columnar limbs, and ranging up to 77 ft. (23.5 m) in length.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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