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brachiosaurus

/ˌbreɪkɪəˈsɔːrəs; ˌbræk-/
noun
1.
a dinosaur of the genus Brachiosaurus, up to 30 metres long: the largest land animal ever known See also sauropod
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for brachiosaurus
n.

1903, Modern Latin, from Greek brakhion "arm" (see brachio-) + -saurus. The forelegs are notably longer than the hind legs.

Online Etymology Dictionary, © 2010 Douglas Harper
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brachiosaurus in Science
brachiosaurus (brā'kē-ə-sôr'əs) or brachiosaur
  (brā'kē-ə-sôr'əs)   
A very large sauropod dinosaur of the genus Brachiosaurus of the Jurassic and Cretaceous Periods. It had forelegs that were longer than its hind legs, and nostrils on top of its head.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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